Implementation in UserBlockCommandFactory only needs
a UserIdentity, no need to document a full User object
Change-Id: I39dcb48bff9f5de8ff964f7ed8f9f2c7da4e4046
Create UnblockUserFactory service, which returns an UnblockUser.
UnblockUser::unblock replaces SpecialUnblock::processUnblock, which
is now deprecated.
Update SpecialUnblock and ApiUnblock to use UnblockUser, removing
the API module's dependency on the special page.
Update SpecialUnblock::processUIUnblock to use UnblockUser, and mark
it for internal use only. It now returns a Status object.
Also add BlockPermissionChecker::checkBasePermissions, which checks
for the 'block' right and the 'hideuser' right if necessary.
Bug: T250020
Change-Id: Ide31da469297f4582ad0e3f7f1a7c40d542923f8
