fix #4739: ui: user list: add column for group memberships

fix #4739: ui: user list: add column for group memberships

To get a fast overview in which groups each user is add a column that
shows all groups they are a member of.

To get that info we need to pass the 'full=1' parameter to the API
endpoint, which then adds tokens and groups for each user to the result.

This is basically only increasing transmission size a bit, as the
backend doesn't needs to do any extra parsing for this information.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
 [T: Reword commit message ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>