Introducing clear package data intent

Clear data Intent can be called from any application and
executes in the PackageInstaller. The user will be asked
to verify that they truly want to clear package data via
an AlertDialog.

This was initially intended to be @SystemApi, but
conversations with API-Review led to it be public.

Test: Covered by a gts-test ag/1806256 and manually tested
by calling from com.android.vending (Play Store).

bug: 33017941
bug: 31008483

Change-Id: Ibeae6620303ba52cc2ebf0383756c9380d3fa013