Add loading tags, starting with croissant and webdataset
Added two tags:
- "croissant" for datasets that have a valid info (= a valid croissant json)
- "webdataset" fro datasets with `info["builder_name"] == "webdataset"`

I implemented this using a new job "dataset-loading-tags" that aims at detecting tags related to dataset loading tools, and then adding the tags to "dataset-hub-cache".

Later we can enrich "dataset-loading-tags" with loading argument that can be used when showing code snippets in dataset pages.

TODO
- [x] add to hub-cache
- [x] tests
Add loading tags, starting with croissant and webdataset: Added two tags:
- "croissant" for datasets that have a valid info (= a valid croissant json)
- "webdataset" fro datasets with `info["builder_name"] == "webdataset"`

I implemented this using a new job "dataset-loading-tags" that aims at detecting tags related to dataset loading tools, and then adding the tags to "dataset-hub-cache".

Later we can enrich "dataset-loading-tags" with loading argument that can be used when showing code snippets in dataset pages.

TODO
- [x] add to hub-cache
- [x] tests