[KM-438][KM-439] Improve Retrieval and Querying feature (#15)

Merge dev_new to main (improve retriever and add querying) (#13)

[NOTICKET] add updated_at metadata & prevent duplicate while adding new embedding (#10)

[NOTICKET] [document]: add doctypes endpoint (#7)

[NOTICKET][DB] add endpoints for dbtypes (#6)

[KM-436][KM-437] add and modify for database and document pipeline (#3)