Privileged apps can now launch their activities across profiles.

Introduced a new INTERACT_ACROSS_PROFILES privileged permission which
allows an application to start a managed profile activity from its personal
profile activity.

Added CrossProfileApps#startAnyActivity(ComponentName, UserHandle) which
requires the INTERACT_ACROSS_PROFILES permission and enables an app from
a personal profile to launch an activity within its managed profile app.

Bug: 118186373
Test: atest com.android.server.pm.CrossProfileAppsServiceImplTest
Test: atest cts/hostsidetests/devicepolicy/src/com/android/cts/devicepolicy/CrossProfileAppsHostSideTest.java
Change-Id: I28aa05c7e54f60eb6144275d31eaf8813e2f10ad