## Summary
Part of https://github.com/elastic/kibana/issues/152224
Follow up to https://github.com/elastic/kibana/issues/153256
This PR onboards maps CM integration into the multi-type search
(`msearch`). It isn't actually used anywhere in the user-facing UI yet,
as first other types need to be migrated to CM.
This PR also adds an example app to test the `msearch` end-to-end.
