remove pathlib.Path with URIs

Pathlib will convert "//" to "/" which causes retry errors when downloading from cloud storage

Thanks !
`os.path.join` will use a backslash `\` on windows which will also fail. You can use this instead in `load_from_disk`:
```python
from .filesystems import is_remote_filesystem

is_local = not is_remote_filesystem(fs)
path_join = os.path.join if is_local else posixpath.join
```

Thank you ! I did a minor change to not have to define a new function and I ran the CI. If it's green we can merge :)

_The documentation is not available anymore as the PR was closed or merged._

> 



> Thank you ! I did a minor change to not have to define a new function and I ran the CI. If it's green we can merge :)

lol it's a battle of +1 imports or +1 functions. LGTM, I was editing fast and swapped which branch gets os vs Path. Should be ok now 🤙

<details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.012043 / 0.011353 (0.000690) | 0.006585 / 0.011008 (-0.004423) | 0.149007 / 0.038508 (0.110499) | 0.039514 / 0.023109 (0.016405) | 0.403893 / 0.275898 (0.127995) | 0.431252 / 0.323480 (0.107772) | 0.009218 / 0.007986 (0.001233) | 0.006108 / 0.004328 (0.001779) | 0.114666 / 0.004250 (0.110416) | 0.044962 / 0.037052 (0.007910) | 0.411592 / 0.258489 (0.153103) | 0.461561 / 0.293841 (0.167721) | 0.059958 / 0.128546 (-0.068589) | 0.029047 / 0.075646 (-0.046599) | 0.456000 / 0.419271 (0.036728) | 0.060744 / 0.043533 (0.017211) | 0.415816 / 0.255139 (0.160677) | 0.430488 / 0.283200 (0.147289) | 0.122477 / 0.141683 (-0.019205) | 1.862910 / 1.452155 (0.410755) | 1.974698 / 1.492716 (0.481981) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.257230 / 0.018006 (0.239224) | 0.606854 / 0.000490 (0.606364) | 0.006175 / 0.000200 (0.005975) | 0.000099 / 0.000054 (0.000044) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.030533 / 0.037411 (-0.006879) | 0.130702 / 0.014526 (0.116177) | 0.143781 / 0.176557 (-0.032775) | 0.183272 / 0.737135 (-0.553863) | 0.151267 / 0.296338 (-0.145071) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.637422 / 0.215209 (0.422213) | 6.503535 / 2.077655 (4.425880) | 2.630387 / 1.504120 (1.126267) | 2.281180 / 1.541195 (0.739985) | 2.354341 / 1.468490 (0.885851) | 1.306497 / 4.584777 (-3.278280) | 5.837184 / 3.745712 (2.091472) | 3.257198 / 5.269862 (-2.012663) | 2.050681 / 4.565676 (-2.514995) | 0.146415 / 0.424275 (-0.277860) | 0.015386 / 0.007607 (0.007779) | 0.790146 / 0.226044 (0.564102) | 8.056137 / 2.268929 (5.787209) | 3.383566 / 55.444624 (-52.061059) | 2.707620 / 6.876477 (-4.168856) | 2.714857 / 2.142072 (0.572785) | 1.520847 / 4.805227 (-3.284380) | 0.266028 / 6.500664 (-6.234636) | 0.091422 / 0.075469 (0.015953) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.656148 / 1.841788 (-0.185640) | 18.833393 / 8.074308 (10.759085) | 21.360824 / 10.191392 (11.169432) | 0.227608 / 0.680424 (-0.452816) | 0.049018 / 0.534201 (-0.485183) | 0.593418 / 0.579283 (0.014135) | 0.656690 / 0.434364 (0.222326) | 0.709171 / 0.540337 (0.168833) | 0.828226 / 1.386936 (-0.558710) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.010112 / 0.011353 (-0.001241) | 0.006761 / 0.011008 (-0.004247) | 0.146723 / 0.038508 (0.108215) | 0.038451 / 0.023109 (0.015342) | 0.524267 / 0.275898 (0.248369) | 0.609484 / 0.323480 (0.286004) | 0.008502 / 0.007986 (0.000516) | 0.006964 / 0.004328 (0.002635) | 0.111396 / 0.004250 (0.107146) | 0.056839 / 0.037052 (0.019787) | 0.514649 / 0.258489 (0.256160) | 0.604212 / 0.293841 (0.310372) | 0.061410 / 0.128546 (-0.067137) | 0.020396 / 0.075646 (-0.055250) | 0.505026 / 0.419271 (0.085754) | 0.067280 / 0.043533 (0.023747) | 0.522249 / 0.255139 (0.267110) | 0.559484 / 0.283200 (0.276284) | 0.120943 / 0.141683 (-0.020740) | 2.124323 / 1.452155 (0.672169) | 2.153397 / 1.492716 (0.660681) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.216614 / 0.018006 (0.198608) | 0.594181 / 0.000490 (0.593692) | 0.004079 / 0.000200 (0.003879) | 0.000117 / 0.000054 (0.000063) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.036925 / 0.037411 (-0.000486) | 0.131322 / 0.014526 (0.116797) | 0.148542 / 0.176557 (-0.028015) | 0.196045 / 0.737135 (-0.541090) | 0.156867 / 0.296338 (-0.139472) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.669722 / 0.215209 (0.454513) | 6.858856 / 2.077655 (4.781202) | 3.093969 / 1.504120 (1.589849) | 2.667385 / 1.541195 (1.126190) | 2.797192 / 1.468490 (1.328702) | 1.334759 / 4.584777 (-3.250018) | 6.024861 / 3.745712 (2.279149) | 3.257779 / 5.269862 (-2.012083) | 2.202816 / 4.565676 (-2.362860) | 0.147617 / 0.424275 (-0.276658) | 0.015451 / 0.007607 (0.007844) | 0.887015 / 0.226044 (0.660970) | 8.371288 / 2.268929 (6.102360) | 3.807451 / 55.444624 (-51.637173) | 3.079483 / 6.876477 (-3.796994) | 3.103321 / 2.142072 (0.961249) | 1.520272 / 4.805227 (-3.284955) | 0.273079 / 6.500664 (-6.227585) | 0.088613 / 0.075469 (0.013143) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.818913 / 1.841788 (-0.022875) | 19.274269 / 8.074308 (11.199960) | 19.871784 / 10.191392 (9.680392) | 0.250388 / 0.680424 (-0.430036) | 0.030562 / 0.534201 (-0.503638) | 0.560566 / 0.579283 (-0.018717) | 0.664701 / 0.434364 (0.230337) | 0.714513 / 0.540337 (0.174176) | 0.827227 / 1.386936 (-0.559710) |

</details>
</details>

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