Fix Client's handling of Enum Values, to support Python >=3.11 enum handling.

[tim-win]

Description

The argilla client for v0 Search and Metrics appears to be broken in Python 3.11 and greater. This comes from a simple mis-resolution of enum values, due to some of the poorly documented python 3.11. In short, given this definition of the TaskType enum:

class TaskType(str, Enum):
    text_classification = "TextClassification"
    token_classification = "TokenClassification"
    text2text = "Text2Text"

in Python 3.10 and before, format strings and the format method will return the value of the target enum:

>>> f'{TaskType.text_classification}'
'TextClassification'

However, in python 3.11 and later, format strings will produce a more verbose description:

>>> f'{TaskType.text_classification}'
'TaskType.text_classification'

The client's Search and Metrics code both use the same pattern, producing an incorrect _API_URL and thereby running into 404's:

class Search(AbstractApi):
    _API_URL_PATTERN = "/api/datasets/{name}/{task}:search"

    def search_records(
        self,
        name: str,
        task: TaskType,
        size: Optional[int] = None,
        **query,
    ):
    ...
    url = Search._API_URL_PATTERN.format(name=name, task=task)
    ...
    response = self.http_client.post(
            path=url,
            json={"query": query} if query else None,
        )
    ...

This PR just updates the way task is handled by the url format function in both APIs, a method that produces the correct value in 3.8, 3.10, 3.11, and 3.12.0a7:

>>> f'{TaskType.text_classification.value}'                                                                                            
'TextClassification'

    url = Search._API_URL_PATTERN.format(name=name, task=task.value)

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

This has been tested locally using pyenv to swap between python 3.8, 3.10, 3.11, and 3.12.0a7 to confirm 3.11 is the change point. Also, tested this in-situ by trying to run AutoPrompt (which only supports 3.10 and below) with this change, and it appears this change is the last thing stopping autoprompt from supporting 3.11!

Checklist

• I followed the style guidelines of this project
• I did a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.20%. Comparing base (5d2bfd2) to head (73ac678).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #4672       +/-   ##
============================================
+ Coverage    45.81%   89.20%   +43.39%     
============================================
  Files          193      193               
  Lines        11814    11814               
============================================
+ Hits          5412    10539     +5127     
+ Misses        6402     1275     -5127     

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[frascuchon]

Thanks @tim-win for your contribution!!!

[tim-win]

🥴 my first open source PR in over a year, I think! Thank you for accepting my change.