Add missing @RequiresPermission to IMM

This is mechanical refactoring that has no behavior change.

 - Add missing @RequiresPermission
 - Describe when INTERACT_ACROSS_USERS_FULL is required
 - Apply the same annotation order
 - Use the same import pattern around permissions

Fix: 256239860
Test: presubmit
Change-Id: I5ba2210e4de54b6941dba148471746f20720f9c6