Adds an "install scenario" field to the appropriate datastructures

This CL adds an "install scenario" field to several data structures used
by the Package Manager.  This value will be used by a following CL to
adjust the invocation of dexopt based on the indicated use case.

Bug: 173137187
Test: build
Merged-In: I1d0df8edf85a598905a5e7509f6c811df5c20e2e
Change-Id: I1d0df8edf85a598905a5e7509f6c811df5c20e2e