feat: expose allow overlapping property

[frascuchon]

Description

This PR adds the allow_overlapping field for span questions to configure span questions with overlapping support. The default value is set to False to align the previous version of the span question.

It must be merged after argilla-io/argilla-server#89

span_question = rg.SpanQuestion(name="spans", .., allow_overlapping=True)
...

Closes #4694

Type of change

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

• New feature (non-breaking change which adds functionality)
• Refactor (change restructuring the codebase without changing functionality)
• Improvement (change adding some improvement to an existing functionality)

How Has This Been Tested

(Please describe the tests that you ran to verify your changes. And ideally, reference tests)

• Test A
• Test B

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
• 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/)

[github-actions]

The URL of the deployed environment for this PR is https://argilla-quickstart-pr-4697-ki24f765kq-no.a.run.app

[burtenshaw]

Functionality looks good.

I left some comments on testing. We could expand testing for all use cases, but I'm not sure how you want the suite to flow.

[burtenshaw]

• Should we separate these tests so that we have with/without overlap?
• Should we add records to both that have overlaps or not?
• Should we assert raises of the overlap error code?

[frascuchon]

Thanks. I've created a new separate test checking possible values for the allow_overlapping flag.

For related records questions, I will include some integration tests. Validations for responses and suggestions are not covered on this SDK, we will cover them in the new SDK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.84%. Comparing base (ffeb2cd) to head (c0c527d).
Report is 32 commits behind head on feat/overlapped-span-questions.

❗ Current head c0c527d differs from pull request most recent head 99de15c. Consider uploading reports for the commit 99de15c to get more accurate results

Additional details and impacted files

@@                        Coverage Diff                         @@
##           feat/overlapped-span-questions    #4697      +/-   ##
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- Coverage                           45.85%   45.84%   -0.01%     
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  Files                                 193      193              
  Lines                               11810    11812       +2     
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  Hits                                 5415     5415              
- Misses                               6395     6397       +2     

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