[FTS] Ability to determine whether a hit was an exact match or a partial match

See more: https://forums.couchbase.com/t/fts-with-phrasesearch/35458

Currently when a match query is used  -

• We must apply analysis rules defined for the field over the search criteria.
• The output tokens are then search for applying the match query's operator rules over it.
  • If the operator is set to AND, we look for the existence of ALL the output tokens
  • If the operator is set to OR (default), we look for the existence of ANY of the tokens
• The result hits are ordered by score (relatively via tf-idf) but there's no way other than looking into the actual documents for a user to determine if the hit was a full match or a partial match when the operator is set to OR.

This is a capability we want to support - which would reflect in the search response.

The same situation is applicable when fuzziness is used as well.