feat: add UIConfig and UserUIConfig [EXT-3738]

[andipaetzold]

Summary

Adds new entities UIConfig and UserUIConfig

Integration tests can only be added once the endpoints are available

TODO

• [ ] Remove page field

Checklist (check all before merging)

• [x] Both unit and integration tests are passing
• [x] There are no breaking changes
• [ ] Changes are reflected in the documentation

When adding a new method:

• [x] The new method is exported through the default and plain CMA client
• [x] All new public types are exported from ./lib/export-types.ts
• [x] Added a unit test for the new method
• [ ] Added an integration test for the new method
• [ ] The new method is added to the documentation