This repo (edx-search) needs re-architecture

[bradenmacdonald]

As we are moving away from Elasticsearch and toward Meilisearch+Typesense, this whole repo needs to be re-architected to provide a better abstraction over the different search engines, and a better API.

See also the various problems listed in State of edx-search 2023

Specifically:

• Provide a consistent way for use cases to be defined/registered (e.g. each use case would be "studio courseware search", "library search", "learner courseware search", "forum search", etc.).
• Manage index creation/update similar to migrations - Improve Meilisearch Index upgrade workflow (reindex_studio) openedx-platform#36868
• Provide a consistent set of management commands / admin tools that works with each use case (create index, delete index, upgrade index, re-populate index)
• Rename to openedx_search ?
• Include example of using Instantsearch.js on the frontend to implement search, and connect directly to Meilisearch/Typesense rather than proxying via the LMS.