Extract hosts/pods/containers/services assets

[klacabane]

Summary

Closes elastic/kibana#155870

The change introduces asset-scoped queries for hosts, pods, containers and services. Each query is responsible for building documents of a single type and setting relationships found in the documents metadata. The queries are only building assets of the concerned type and not the related ones; for example if host document contains pod metadata, the host logic will set the pod ean as a child, but leave the pod asset creation to the pod logic. This may create dangling references but keeps the post processing of each query simple, and can be updated later if needed.

Testing

• setup clusters in config.json (I used edge-oblt as source and local es as dest)
• run npx ts-node run.ts --read=<source> --write=<dest>
• 4 types of assets should be inserted in assets-* data streams
• one can use assets-manager API to get results of random assets (eg GET kbn:/api/asset-manager/assets/related?relation=ancestors&from=2023-05-05T00:00:00.000Z&ean=service:emailService&maxDistance=3)