[server] Send a message when friend request is sent or accepted
[server] Send a message when friend request is sent or accepted

Test Plan: I've sent a friend request and a message was created and successfully displayed. The same for accepting a request.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D396

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