Improve Settings types

[flevi29]

Pull Request

What does this PR do?

• simplifies, improves, separates and documents Settings types

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.88%. Comparing base (1064d09) to head (ab6b24b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1864      +/-   ##
==========================================
+ Coverage   98.84%   98.88%   +0.03%     
==========================================
  Files          17       19       +2     
  Lines        1565     1608      +43     
  Branches      338      339       +1     
==========================================
+ Hits         1547     1590      +43     
  Misses         18       18              

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