Issue #3611624 by noemi.mancini: Add experimental submodule for server-side query execution

Noemi Mancinirequested to merge
issue/search_api_typesense-3611624:3611624-implement-server-side-query into 1.0.x

Add the search_api_typesense_query experimental submodule providing a backend plugin that subclasses the Typesense backend and executes Search API queries server-side: full-text (q/query_by), filters (filter_by from condition groups), sort, pagination, and facets. The main backend and its InstantSearch pattern are unchanged; only servers that select the experimental backend get server-side execution.

Closes #3611624

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