Enhance facet search to support full-text search

[macraig]

Cross-posting from meilisearch/meilisearch#5443

"Meilisearch only considers one term for facetQuery. e.g., if 'harry potter' is typed, the facet search considers 'harry potter' as one single term."

Does this mean that if I type "Potter", it won't be able to find "Harry Potter"?

Expected behavior
The facet search should support full-text search instead of treating the entire query as a single term. It should be able to match any relevant part of a multi-word string, just like the main search functionality.
Would it be possible to improve facetQuery to support full-text search instead of single-term matching?