[KM-533] add table level schema, differentiate with chunk level. expand retrieval result with FK exploration

[NOTICKET] fix query now use orchestrator msg, rework db pipeline replace ingestion logic

[NOTICKET] fix delete, now can filter by user

[NOTICKET] add db_client for querying

[NOTICKET] add updated_at field for metadata & delete old embedding before appending

[NOTICKET] minor code refactor

[NOTICKET][DB] fix mysql pipeline

[KM-437][DB] add mysql, sqlserver, bigquery, snowflake connections

[NOTICKET][DB] menyesuaikan format struktur db_pipeline sesuai dengan file lain

[DB] fix/rename db_pipeline.py

[NOTICKET] new metadata format for cleaner code

[KM-441] add mean and median

[NOTICKET][DB] refactor code to new repo