Pass down storage options
Remove implementation-specific kwargs from `file_utils.fsspec_get` and `file_utils.fsspec_head`, instead allowing them to be passed down via `storage_options`. This fixes an issue where s3fs did not recognize a timeout arg as well as fixes an issue mentioned in https://github.com/huggingface/datasets/issues/5281 by allowing users to pass down `storage_options` all the way from `datasets.load_dataset` to support implementation-specific credentials

Supports something like the following to provide credentials explicitly instead of relying on boto's methods of locating them

```
load_dataset(..., data_files=["s3://..."], storage_options={"profile": "..."})
```