Added new option add / remove contacts in dropdown and created navigation to modify the loaded component in the toolbar.
Enabled addition of new members into a group chat by the admin.
Enabled removal of members of a group chat by the admin.
Added into `ChatContentView` components related to chat toolbar:
- `StatusTagSelector` and its corresponding logic
- Moved `StatusChatInfoButton` from toolbar to content view.
Added `esc` key event to leave the group chat add / remove panel.
Updated `StatusQ` link.
Closes#5522
Alexandra Betouni
Patryk Osmaczko
Noelia