User profile should show which admin added a user

When multiple people administer Bitbucket it can be hard to know why a particular user has been given write access. This becomes especially important when approaching a licensing limit.

When you click on a particular user in admin it would be useful to see who added them.

Workaround: Audit events capture such changes and could be archived and inspected if needed. Details: https://confluence.atlassian.com/bitbucketserver/audit-events-in-bitbucket-server-776640423.html