Modify setApplicationHidden and isApplicationHidden APIs

* Introduced new logic that allows the profile owner of an
  organization-owned device (COPE PO) to hide/unhide system
  apps in the personal profile.
* Modified both APIs to be callable on the parent profile
  instance if called by the COPE PO.
* When called by the COPE PO, the package provided
  must be a system package, otherwise an IllegalArgument
  Exception is thrown.

Bug: 147413198
Test: manual testing
      atest com.android.server.devicepolicy.DevicePolicyManagerTest
      atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testApplicationHidden
      atest com.android.cts.devicepolicy.ManagedProfileTest#testParentProfileApiDisabled

Change-Id: I4fae8acee9f00e3b9c805f29cf826f917cda6abd