Add User Groups, lists of users that creators can use to manage access to their content

[Floppy]

Follows up #5127 to add UI for actually using groups. Resolves #2963.

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.26% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a98340f35af0ea63acf24d14d83b17017e51588d)	5800	4891	84.33%
Head commit (314e08a58290c03b271b8844b9aceaa0e2645733)	5827 (+27)	4929 (+38)	84.59% (+0.26%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#5152)	58	58	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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