Add behat test for new message drawer to manage contacts

Feature

In order to communicate with fellow users
As a user
I need to be able to add, decline and remove users

Scenarios

Add/Request contact

• send a 'contact request' to someone to add a contact
• to accept a 'contact request' from someone
• decline a 'contact request' from someone

Remove existing contact

• View contacts in the "contacts" section (users added after contact request accepted) to remove

Decline a contact in the "contact requests" section