fix: push_to_argilla and from_argilla consistency issues

[alvarobartt]

Description

This PR removes the unnecessary json.loads(field.json()) and json.loads(question.json()) as all the fields in those pydantic.BaseModels are JSON-serializable, so we can just provide the dict to the endpoint.

Besides that, we're also using the dict for FeedbackRecords, and then ensuring that the user_id in each response, which is an UUID and so on, not JSON-serializable, is properly serialized as a string in the add_records SDK function.

This also aligns both the FeedbackRecord logging in Argilla under the scenarios of pushing a new dataset and pushing records to an existing dataset.

Finally, also the from_argilla field and question re-construction is patched, as we were still using construct which was not respecting the Config set on those pydantic.BaseModels as construct implies Config.extra = 'allow'. So on, now that's patched too, and the FeedbackDataset retrieved via from_argilla is exactly the same one as the one logged via push_to_argilla and/or push_to_huggingface; as well as the argilla_id assignment when retrieving a FeedbackDataset.from_argilla once the argilla_id has already been set as cls.argilla_id = ....

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (change adding some improvement to an existing functionality)

How Has This Been Tested

• Add unit tests for push_to_argilla to make sure the API doesn't throw any HTTP 422 when the payload contains UUIDs
• Add unit tests for from_argilla to make sure the retrieve FeedbackDataset is consistent to what we should expect

Checklist

• I have merged the original branch into my forked branch
• I added relevant documentation
• follows the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[gabrielmbmb]

LGTM!