feat: add HybridSearchInfo field to SearchResultHit

[hungcs]

Add a new HybridSearchInfo field to the SearchResultHit struct to support hybrid search metadata. This field includes rank_fusion_score for combined scoring from keyword and vector search results.

[haydenhoang]

Hi @hungcs, updates must be made to the API spec in this repository.
Running go generate ./... will then pull those changes and generate the types.

[hungcs]

thanks @haydenhoang, sorry for the delay - pr here: typesense/typesense-api-spec#95

[hungcs]

@haydenhoang i ran go generate ./... and it ended up pulling in a lot of other api changes, since it runs on the latest openapi.yml of typesense-api-spe master - is that okay? thanks!

[haydenhoang]

@hungcs that's completely normal as long as the tests pass. We actually run the command every now and then to keep the types updated. If the tests fail, it might be an indication that there is a breaking change in the api. Let me know if that happens.

[haydenhoang]

@jasonbosco this PR looks good. Could you approve the workflow and merge it if the tests pass?