refs #15642 [fid] API admin section

* adds actions and routes to
** user list
** user profile manipulation
* introduces basic authorization and permission handling

* introduces Admin config section containing
** editable fields
** applicable user permissions
** disable select inputs

* user overview
** styles user overview as a table
** links to user edit page for each

* adds 'denied' values for unselected permissions

* force login for admin pages
* flushes user list cache on successfull edit
** displays latest data in user list

* reacts on admin roles from API (cf. #15692)

* VuFind permission handling
** adds PermissionProvider to handle FID API permissions via Permission ViewHelper