Make push_to_hub return CommitInfo

Make `push_to_hub` return `CommitInfo`.

This is useful, for example, if we pass `create_pr=True` and we want to know the created PR ID.

CC: @severo for the use case in https://huggingface.co/datasets/jmhessel/newyorker_caption_contest/discussions/4

Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_6492). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

This PR is ready to review @huggingface/datasets.

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

PyArrow==8.0.0

<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) | 0.005093 / 0.011353 (-0.006259) | 0.003695 / 0.011008 (-0.007313) | 0.064648 / 0.038508 (0.026140) | 0.054677 / 0.023109 (0.031568) | 0.242007 / 0.275898 (-0.033891) | 0.265216 / 0.323480 (-0.058264) | 0.003847 / 0.007986 (-0.004138) | 0.003773 / 0.004328 (-0.000556) | 0.048595 / 0.004250 (0.044345) | 0.038122 / 0.037052 (0.001070) | 0.245698 / 0.258489 (-0.012791) | 0.278095 / 0.293841 (-0.015746) | 0.027488 / 0.128546 (-0.101058) | 0.011002 / 0.075646 (-0.064644) | 0.211443 / 0.419271 (-0.207829) | 0.035664 / 0.043533 (-0.007869) | 0.244754 / 0.255139 (-0.010385) | 0.261078 / 0.283200 (-0.022121) | 0.017768 / 0.141683 (-0.123915) | 1.130765 / 1.452155 (-0.321390) | 1.189825 / 1.492716 (-0.302891) |

### 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) | 0.093027 / 0.018006 (0.075021) | 0.302193 / 0.000490 (0.301703) | 0.000207 / 0.000200 (0.000007) | 0.000045 / 0.000054 (-0.000009) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018413 / 0.037411 (-0.018999) | 0.062715 / 0.014526 (0.048190) | 0.073287 / 0.176557 (-0.103269) | 0.120394 / 0.737135 (-0.616741) | 0.077573 / 0.296338 (-0.218765) |

### 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) | 0.284445 / 0.215209 (0.069236) | 2.780718 / 2.077655 (0.703063) | 1.460988 / 1.504120 (-0.043132) | 1.345799 / 1.541195 (-0.195395) | 1.399892 / 1.468490 (-0.068598) | 0.576051 / 4.584777 (-4.008726) | 2.418792 / 3.745712 (-1.326921) | 2.901330 / 5.269862 (-2.368532) | 1.765083 / 4.565676 (-2.800593) | 0.063555 / 0.424275 (-0.360720) | 0.004991 / 0.007607 (-0.002616) | 0.339657 / 0.226044 (0.113613) | 3.372963 / 2.268929 (1.104034) | 1.853667 / 55.444624 (-53.590958) | 1.552022 / 6.876477 (-5.324454) | 1.616452 / 2.142072 (-0.525620) | 0.652309 / 4.805227 (-4.152919) | 0.121125 / 6.500664 (-6.379539) | 0.042420 / 0.075469 (-0.033049) |

### 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) | 0.954514 / 1.841788 (-0.887274) | 11.853736 / 8.074308 (3.779428) | 10.624571 / 10.191392 (0.433179) | 0.134118 / 0.680424 (-0.546306) | 0.014200 / 0.534201 (-0.520001) | 0.290106 / 0.579283 (-0.289177) | 0.270637 / 0.434364 (-0.163727) | 0.336155 / 0.540337 (-0.204182) | 0.443962 / 1.386936 (-0.942974) |

</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) | 0.005282 / 0.011353 (-0.006071) | 0.003526 / 0.011008 (-0.007482) | 0.048994 / 0.038508 (0.010486) | 0.055345 / 0.023109 (0.032236) | 0.271587 / 0.275898 (-0.004311) | 0.294676 / 0.323480 (-0.028804) | 0.003989 / 0.007986 (-0.003996) | 0.002594 / 0.004328 (-0.001735) | 0.048310 / 0.004250 (0.044059) | 0.039945 / 0.037052 (0.002893) | 0.277304 / 0.258489 (0.018815) | 0.312017 / 0.293841 (0.018176) | 0.028364 / 0.128546 (-0.100182) | 0.010683 / 0.075646 (-0.064963) | 0.057990 / 0.419271 (-0.361281) | 0.032418 / 0.043533 (-0.011115) | 0.273835 / 0.255139 (0.018697) | 0.288585 / 0.283200 (0.005385) | 0.018964 / 0.141683 (-0.122719) | 1.148863 / 1.452155 (-0.303292) | 1.195684 / 1.492716 (-0.297032) |

### 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) | 0.091967 / 0.018006 (0.073960) | 0.303236 / 0.000490 (0.302747) | 0.000214 / 0.000200 (0.000015) | 0.000051 / 0.000054 (-0.000003) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.021960 / 0.037411 (-0.015452) | 0.068744 / 0.014526 (0.054218) | 0.081167 / 0.176557 (-0.095390) | 0.119623 / 0.737135 (-0.617513) | 0.084965 / 0.296338 (-0.211373) |

### 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) | 0.297740 / 0.215209 (0.082531) | 2.924856 / 2.077655 (0.847201) | 1.602080 / 1.504120 (0.097960) | 1.494083 / 1.541195 (-0.047112) | 1.544662 / 1.468490 (0.076172) | 0.581212 / 4.584777 (-4.003565) | 2.451064 / 3.745712 (-1.294648) | 2.875213 / 5.269862 (-2.394649) | 1.780777 / 4.565676 (-2.784900) | 0.063751 / 0.424275 (-0.360524) | 0.004967 / 0.007607 (-0.002641) | 0.350321 / 0.226044 (0.124276) | 3.449585 / 2.268929 (1.180657) | 1.977666 / 55.444624 (-53.466958) | 1.685125 / 6.876477 (-5.191351) | 1.734466 / 2.142072 (-0.407606) | 0.657477 / 4.805227 (-4.147750) | 0.116767 / 6.500664 (-6.383898) | 0.041400 / 0.075469 (-0.034069) |

### 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) | 0.985751 / 1.841788 (-0.856037) | 12.300065 / 8.074308 (4.225756) | 10.608238 / 10.191392 (0.416846) | 0.139907 / 0.680424 (-0.540517) | 0.015379 / 0.534201 (-0.518822) | 0.283528 / 0.579283 (-0.295755) | 0.278751 / 0.434364 (-0.155613) | 0.328811 / 0.540337 (-0.211527) | 0.584041 / 1.386936 (-0.802895) |

</details>
</details>

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