Add groups to upload members dialog

By popular demand, the upload members dialog in the current GUI will be extended to also handle groups as reviewers and coauthors.

• API endpoint /groups
  • MultiID filter
  • Partial terms filter
  • Tests
• GUI: EditMembersDialog
  • Add groups to members table
    • Normalize users and groups to members
  • Add group search
  • Add group 'add'
  • Update + add tests
  • UX Upgrade (with @wojasadr)
    • Remove entries count
    • Cancel by clicking in the background
    • Remove Add button, selecting adds to table
    • Tabs instead of toggle switch
    • Add 🔍 to input field
    • Change main description (add, edit, remove).