Family Member Connections

In this PR, we are trying to follow up on issue #56. Here are some progress checklists:

[x] Every user creation related to a person will create a family connection entry
[x] User can send a family connection request to another user
[x] User can cancel a family connection request which has been sent to another user
[x] User can accept a family connection request from another user
[x] User can reject a family connection request from another user
[ ] User can remove a family connection from another user
[ ] User can browse incoming family connection requests from other users
[ ] User can browse their family connection requests to others
[ ] Prepare for family relationships within family connection data (eg: requester user is uncle, requested user is nephew)
[ ] Add policy permission for accepting the family connection request
[ ] Managers can accept or reject a family connection request.

nafiesl / silsilah