Not 100% finished yet ! EZP-22253 relation list field in the raw content view

## Task
Goal here is to display the object relation list field in the raw content view of the platformUI

## Screenshots

Will come soon !

## Links

Will come soon !

## Todo

- Make a proper pull request (screenshots, links...etc) .
- Finishing tests: currently plugin tests are done, and view tests 80% done ( tests related to the retry button, to load content, fail.
- Rebase commits.