Insetting notifications on the lock screen

We are now insetting the notifications on the
lockscreen.
This also improves the clipping to the notifications
since we can't just clip the whole content to the
outline bounds.

Test: add notifications on lockscreen, observe inset. Try swiping too.
Test: runtest -x packages/SystemUI/tests/src/com/android/systemui/statusbar/NotificationCustomViewWrapperTest.java
Bug: 69168591
Change-Id: Ie3f57dd4938bc97124fb98230cc9427fd4973ead