Adapt image datasets
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This PR can be merged after #3163 is merged (this PR is pretty big because I was working on the forked branch).

@lhoestq @albertvillanova Could you please take a look at the changes in `src/datasets/utils/streaming_download_manager.py`? These changes were required to support streaming of the `cats_vs_dogs` and the `beans` datasets. The CI failures are due to the missing fields in the README files. and thanks for adding support for Path.name and Path.parent for streaming :)
This PR:
* adapts the ImageClassification template to use the new Image feature
* adapts the following datasets to use the new Image feature:
  * beans (+ fixes streaming)
  * cast_vs_dogs (+ fixes streaming)
  * cifar10
  * cifar100
  * fashion_mnist
  * mnist
  * head_qa

cc @nateraw
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