feat: add dataset support to be created using distribution settings

[jfcalvo]

Description

This PR is the first one related with distribution task feature, adding the following changes:

• Added distribution JSON column to datasets table:
  • This column is non-nullable so a value is always required when a dataset is created.
  • By default old datasets will have the value {"strategy": "overlap", "min_submitted": 1}.
• Added distribution attribute to DatasetCreate schema:
  • None is not a valid value.
  • If no value is specified for this attribute DatasetOverlapDistributionCreate with min_submitted to 1 is used.
  • DatasetOverlapDistributionCreate only allows values greater or equal than 1 for min_submitted attributed.
• Now the context create_dataset function is receiving a dictionary instead of DatasetCreate schema.
• Moved dataset creation validations to a new DatasetCreateValidator class.

Update of distribution attribute for datasets will be done in a different issue.

Closes #5005

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)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (change restructuring the codebase without changing functionality)
• Improvement (change adding some improvement to an existing functionality)
• Documentation update

How Has This Been Tested

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

• Adding new tests and passing old ones.
• Check that migration works as expected with old datasets and SQLite.
• Check that migration works as expected with old datasets and PostgreSQL.

Checklist

• 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 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

Attention: Patch coverage is 97.24771% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.00%. Comparing base (60d9340) to head (91eb6b1).

Files	Patch %	Lines
...server/src/argilla_server/search_engine/commons.py	33.33%	2 Missing ⚠️
...la-server/src/argilla_server/search_engine/base.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@                               Coverage Diff                                @@
##           feat/add-dataset-automatic-task-distribution    #5013      +/-   ##
================================================================================
+ Coverage                                         91.93%   92.00%   +0.06%     
================================================================================
  Files                                               135      137       +2     
  Lines                                              5818     5905      +87     
================================================================================
+ Hits                                               5349     5433      +84     
- Misses                                              469      472       +3     

Flag	Coverage Δ
argilla-server	92.00% <97.24%> (+0.06%)	⬆️

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