Add support to pass Score as FTS parameter

With Couchbase 6.6, FTS team introduced an option to avoid scoring and was deed useful for searching and flex-index from the query service.

We've seen that this optimization has additional benefits for direct FTS querying. We need this exposed from the SDKs as well.

Provide Ability to pass new Search Option
Score with a value of none (score:none) - this should suppress scoring.