codeintel: RFC 235: Update worker to write to Postgres
Created by: efritz
A step towards RFC 235: Move LSIF data to Postgres. Closes https://github.com/sourcegraph/sourcegraph/issues/13889.
This PR writes new data to the Postgres-backed bundle store introduced https://github.com/sourcegraph/sourcegraph/pull/13923. Do not merge this PR until https://github.com/sourcegraph/sourcegraph/pull/13924 has been completed and deployed.