post http://localhost:9100/api/user/groups
Create or update a user group.
Role Encodings
Admin for all projects:
["*:*:*"]
Curator for project_id == 1:["*:*:1"]
Curator for multiple projects:["*:*:1,2,3"]
Reviewer for project_id == 1:["common:expert:1"]
Reviewer for multiple projects:["common:expert:1,2,3"]
Curator for some project, reviewer for another:["*:*:1,2", "common:expert:3"]