feat: add support to use datasets using features with sequences of class labels

[jfcalvo]

Description

This PR adds the following changes:

• Add casting for features using sequences of class labels (casting them using int2str function).
• Casting to string values for suggestions mapped to multi label questions (iterating over the values).

Refs https://github.com/argilla-io/roadmap/issues/21

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested

• [x] Adding additional tests to our suite.

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm 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/)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.18%. Comparing base (d375c4b) to head (8f70b4b). Report is 1 commits behind head on feat/argilla-direct-feature-branch.

Files with missing lines	Patch %	Lines
argilla-server/src/argilla_server/contexts/hub.py	93.75%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat/argilla-direct-feature-branch #5613 +/- ## ====================================================================== - Coverage 91.20% 91.18% -0.02% ====================================================================== Files 150 150 Lines 6251 6260 +9 ====================================================================== + Hits 5701 5708 +7 - Misses 550 552 +2 ``` | [Flag](https://app.codecov.io/gh/argilla-io/argilla/pull/5613/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io) | Coverage Δ | | |---|---|---| | [argilla-server](https://app.codecov.io/gh/argilla-io/argilla/pull/5613/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io) | `91.18% <94.73%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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