Extend providedInternalInsets to be type specific

This change will change the providedInternalInsets from a single insets
to a insets array. The one adding the insets can make use of the array
to apply different insets to the window when calculating the provided
insets by the window for different insets types.

With that, the task bar can provide zero insets for the tappable element
type when stashed.

Bug: 215411414
Test: DisplayPolicyTests
Change-Id: I84cd7ef6a2bc19229d3c09f752f65c83eb5c7dde