Finalize Reworked Hugging Face Connector

[PGijsbers]

See #24

[PGijsbers]

Connector can be found at: https://github.com/aiondemand/huggingface-connector
Status:

• reviewed
• on test
• on production

note: unlike the current connector, this one does not yet try to register related publications.

[PGijsbers]

It's mostly done (and has been used to index data in the production server), but there are some final kinks from running it:

• improvements to error handling (e.g., which errors to log, which to ignore, which to error on immediately, which to error on if they happen with high frequency)
• allow different modes (e.g., only insert or only update)
• a discussion on what to do with assets that are removed from Hugging Face (remove them from AIoD? Mark them as deleted on the host platform? Probably the latter, but this would also require additional metadata to be stored in AIoD)

Work has been transferred to UCC (@mardalla as lead)