API view to search for users

[HuxleyBerry]

Create an API view which searches for the users whose names start with a given string. These users should be returned with the following information:

• Avatar
• Username
• User id
• Friend status. This represents one of four possibilities
  • The logged in user is friends with the given user
  • The logged in user has sent a friend request to the given user, but it is yet to be accepted.
  • The given user has sent a friend request to the logged in user, but it is yet to be accepted (also return the friendship id in this case).
  • No friend request has been sent from the logged in user to the given user or vice versa

The list of users should be truncated so that no more than 15 users are returned. However, make sure that a user whose name exactly matches the supplied string is not among those who is omitted due to the truncation.

[github-actions]

Branch issue-94-API_view_to_search_for_users created!