Merge #5355

5355: Support fetching the pooling method from the model configuration r=Kerollmops a=dureuill

Pull Request

Fixes #5354

What does this PR do?

Fetches the pooling configuration from the model repository
Use a pooling method that depends on the pooling configuration of that model.
Allow overriding the pooling method with a new huggingFace embedder parameter pooling
- for backward-compatibility with Meilisearch v1.13
- for compatibility with embedders that exhibit the same behavior as Meilisearch v1.13
Handle the default value of that new parameter
- for compatibility, when importing a db/a dump, it should be set to forceMean
- when (re)set from the settings for an embedder, it should be set to useModel

Co-authored-by: Louis Dureuil louis@meilisearch.com

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