Publish origin_intrinsic_metadata to Kafka.
So swh-search can use a Kafka client to fill its DB with metadata.
Controversial points:
- It adds a new Kafka topic, of objects that are not part of the data model
- Only this idx-storage endpoint writes to Kafka (because I don't think we need the other ones) -> inconsistency
Depends on !194 (closed) ^ implementation detail (some tests are currently failing in that diff because of data validation issue which are being fixed in this 1958)
Migrated from D1959 (view on Phabricator)