Add `mode` parameter to `Image` feature

Fix https://github.com/huggingface/datasets/issues/6675

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_6735). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

<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) | 0.005009 / 0.011353 (-0.006344) | 0.003547 / 0.011008 (-0.007461) | 0.063014 / 0.038508 (0.024506) | 0.027699 / 0.023109 (0.004589) | 0.247140 / 0.275898 (-0.028758) | 0.273610 / 0.323480 (-0.049870) | 0.003115 / 0.007986 (-0.004871) | 0.002712 / 0.004328 (-0.001616) | 0.049134 / 0.004250 (0.044883) | 0.041582 / 0.037052 (0.004530) | 0.269992 / 0.258489 (0.011503) | 0.294516 / 0.293841 (0.000675) | 0.027818 / 0.128546 (-0.100728) | 0.010568 / 0.075646 (-0.065078) | 0.207710 / 0.419271 (-0.211561) | 0.035767 / 0.043533 (-0.007766) | 0.260058 / 0.255139 (0.004919) | 0.277615 / 0.283200 (-0.005585) | 0.020192 / 0.141683 (-0.121491) | 1.116863 / 1.452155 (-0.335292) | 1.156868 / 1.492716 (-0.335848) |

### 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) | 0.095087 / 0.018006 (0.077081) | 0.303249 / 0.000490 (0.302759) | 0.000215 / 0.000200 (0.000015) | 0.000053 / 0.000054 (-0.000001) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018866 / 0.037411 (-0.018545) | 0.063853 / 0.014526 (0.049328) | 0.073863 / 0.176557 (-0.102693) | 0.121399 / 0.737135 (-0.615737) | 0.076014 / 0.296338 (-0.220325) |

### 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) | 0.289843 / 0.215209 (0.074634) | 2.844085 / 2.077655 (0.766431) | 1.528022 / 1.504120 (0.023902) | 1.397352 / 1.541195 (-0.143843) | 1.394676 / 1.468490 (-0.073814) | 0.555899 / 4.584777 (-4.028878) | 2.354010 / 3.745712 (-1.391702) | 2.737715 / 5.269862 (-2.532146) | 1.731260 / 4.565676 (-2.834416) | 0.062315 / 0.424275 (-0.361960) | 0.004920 / 0.007607 (-0.002687) | 0.342921 / 0.226044 (0.116877) | 3.416529 / 2.268929 (1.147600) | 1.862941 / 55.444624 (-53.581684) | 1.599661 / 6.876477 (-5.276816) | 1.617200 / 2.142072 (-0.524873) | 0.635129 / 4.805227 (-4.170099) | 0.121651 / 6.500664 (-6.379013) | 0.041867 / 0.075469 (-0.033602) |

### 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) | 0.990825 / 1.841788 (-0.850962) | 11.435576 / 8.074308 (3.361268) | 9.490194 / 10.191392 (-0.701198) | 0.133295 / 0.680424 (-0.547129) | 0.014061 / 0.534201 (-0.520140) | 0.288648 / 0.579283 (-0.290635) | 0.268874 / 0.434364 (-0.165490) | 0.323288 / 0.540337 (-0.217049) | 0.426090 / 1.386936 (-0.960846) |

</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) | 0.006712 / 0.011353 (-0.004641) | 0.003723 / 0.011008 (-0.007285) | 0.049814 / 0.038508 (0.011306) | 0.039323 / 0.023109 (0.016213) | 0.279244 / 0.275898 (0.003346) | 0.297139 / 0.323480 (-0.026341) | 0.004197 / 0.007986 (-0.003788) | 0.002753 / 0.004328 (-0.001576) | 0.048820 / 0.004250 (0.044569) | 0.049593 / 0.037052 (0.012541) | 0.287247 / 0.258489 (0.028758) | 0.338078 / 0.293841 (0.044237) | 0.029303 / 0.128546 (-0.099243) | 0.010292 / 0.075646 (-0.065354) | 0.057852 / 0.419271 (-0.361419) | 0.053390 / 0.043533 (0.009857) | 0.275155 / 0.255139 (0.020016) | 0.292891 / 0.283200 (0.009692) | 0.020007 / 0.141683 (-0.121676) | 1.161731 / 1.452155 (-0.290424) | 1.232162 / 1.492716 (-0.260555) |

### 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) | 0.092848 / 0.018006 (0.074842) | 0.301180 / 0.000490 (0.300690) | 0.000236 / 0.000200 (0.000036) | 0.000050 / 0.000054 (-0.000005) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022477 / 0.037411 (-0.014934) | 0.077012 / 0.014526 (0.062486) | 0.087335 / 0.176557 (-0.089222) | 0.126761 / 0.737135 (-0.610374) | 0.089249 / 0.296338 (-0.207090) |

### 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) | 0.290722 / 0.215209 (0.075513) | 2.884485 / 2.077655 (0.806830) | 1.565775 / 1.504120 (0.061656) | 1.442369 / 1.541195 (-0.098825) | 1.453995 / 1.468490 (-0.014495) | 0.563193 / 4.584777 (-4.021584) | 2.413610 / 3.745712 (-1.332102) | 2.684567 / 5.269862 (-2.585295) | 1.753322 / 4.565676 (-2.812354) | 0.061879 / 0.424275 (-0.362396) | 0.005080 / 0.007607 (-0.002527) | 0.347274 / 0.226044 (0.121229) | 3.435836 / 2.268929 (1.166907) | 1.937893 / 55.444624 (-53.506731) | 1.657824 / 6.876477 (-5.218653) | 1.777767 / 2.142072 (-0.364305) | 0.656757 / 4.805227 (-4.148471) | 0.117144 / 6.500664 (-6.383520) | 0.040691 / 0.075469 (-0.034778) |

### 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) | 1.012435 / 1.841788 (-0.829353) | 12.038001 / 8.074308 (3.963693) | 10.363947 / 10.191392 (0.172555) | 0.140711 / 0.680424 (-0.539713) | 0.014937 / 0.534201 (-0.519264) | 0.291070 / 0.579283 (-0.288213) | 0.277180 / 0.434364 (-0.157184) | 0.327433 / 0.540337 (-0.212904) | 0.439767 / 1.386936 (-0.947169) |

</details>
</details>

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