Entity Reference field formatter should support paragraphs

Added support for entity_reference_revisions and a very rudimentary test.

Thank you, all good and comes with a test. Merged.

Now that this issue is closed, please review the contribution record.

As a contributor, attribute any organization helped you, or if you volunteered your own time.

Maintainers, please credit people who helped resolve this issue.

Test is very rudimentary. Just scraps the surface.