Add support to the facet setting customization at the index level

[brunoocasali]

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Also, if you are a maintainer, please add any clarification and instructions about this issue.

Related to:

• parent issue: Changes regarding Meilisearch v0.28.0 integration-guides#205
• engine issue: Settings API - Customize the hard limits for pagination and faceting specifications#157, Add limit of facet value and a setting to let the users customize it meilisearch#2368

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Add a faceting index settings resource to manage customization of the maximum value per facet.

• Expose faceting object on /indexes/:index_uid/settings endpoints.
• Add GET/PATCH/DELETE - /indexes/:index_uid/settings/faceting endpoints.

The faceting object definition is made of the following properties:

• maxValuesPerFacet type (int)

More information about what each field does could be checked in the spec.

Check the other customization methods for reference like: synonyms, searchableAttributes, filterableAttributes.

TODO:

• Add the new methods to customize faceting
  • GET /indexes/:index_uid/settings/faceting
  • PATCH /indexes/:index_uid/settings/faceting
  • DELETE /indexes/:index_uid/settings/faceting
• Add tests