[META] Fieldgroup support

Problem/Motivation

Field group is a very frequently used module, so I think it's worth to support it (optionally).

This meta issue issue if for Fieldgroup related issues:
🐛 When field_group is enabled, all fields are removed from clone process Needs review
🐛 Field groups are not copied when cloning display RTBC

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes