## Summary

This PR changes the types of the Case entity to separate the SO
attributes from the HTTP APIs.

### Notable changes
- A new server-side type is created to describe the data persistent into
ES through the SO client. It is called `CasePersistedAttributes`.
- The type `CaseResponse` is renamed to `Case`.
- The type `CasesResponse` is renamed to `Cases`.
- The type `Case` is renamed to `CaseUI`.
- The type `Cases` is renamed to `CasesUI`.

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Jonathan Buttner <jonathan.buttner@elastic.co>

…e layer (#155325)

This PR separates the http API io-ts types from the types that are used
in the cases service layer to interact with the saved object client.
This PR is specifically for the user actions it only affects the types
used when interacting with the saved object client and doesn't touch the
transformation logic yet.

Issue: #153726

…es-feature

This PR separates the http API io-ts types from the types that are used
in the cases service layer to interact with the saved object client.
This PR is specifically for the attachments it only affects the types
used when interacting with the saved object client and doesn't touch the
transformation logic yet.

Issue: #153726

This PR separates the http API io-ts types from the types that are used
in the cases service layer to interact with the saved object client.
This PR is splits up the remaining types within the service layer
(configure and connector mappings).

Issue: #153726