Friends: invites

### Description

After users send friend requests, the other side will need a way to manage invite requests.

### Requirements

- Clicking on "Friend requests" in the "Add friends" modal will change the modal to be able to manage invites
- Must have a way to return back to previous menu via a "Return" button
- Displays all incoming invites with the inviter's profile picture, full name, an "Accept" and "Delete" button
- Displays all outgoing invites after incoming invites labelled the same except with a "Pending" button that changes to a "Withdraw" button.
- All action buttons do nothing for now
- Outgoing invites and outgoing invites are separated by a divider line