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3942: Normalize for the search the facets values r=ManyTheFish a=Kerollmops This PR improves and fixes the search for facet values feature. Searching for _bre_ wasn't returning facet values like _brévent_ or _brô_. The issue was related to the fact that facets are normalized but not in the same way as the `searchableAttributes` are. We decided to normalize them further and add another intermediate database where the key is the normalized facet value, and the value is a set of the non-normalized facets. We then use these non-normalized ones to get the correct counts by fetching the associated databases. ### What's missing in this PR? - [x] Apply the change to the whole set of `SearchForFacetValue::execute` conditions. - [x] Factorize the code that does an intermediate normalized value fetch in a function. - [x] Add or modify the search for facet value test. Co-authored-by: Clément Renault <clement@meilisearch.com> Co-authored-by: Kerollmops <clement@meilisearch.com>