SystemApi for specifying insets in LayoutParams

Exposing a minimal subset of the hidden InsetsFrameProvider, only
a constructor and the actual insets.

Bug: 350007866
Bug: 327742113
Test: presubmit, VDM demo app, CTS
Flag: android.companion.virtualdevice.flags.status_bar_and_insets
Change-Id: I08deeda77ea594648074e6b8b85e3d5a0dfb0516