[NOTICKET] new metadata format for cleaner code

[KM-441] add mean and median

[NOTICKET][DB] refactor code to new repo

[NOTICKET]: update folder document_pipelines after pipelines

[NOTICKET]: add document pipeline, simplify document API

[noticket] add gitignore

[NOTICKET] Init db_client endpoint

Update README.md

[KM-467] [DED][AI] Orchestration Agent - Init

initial commit