Create PackageInstalledParams for onPackageInstalled().

So that the API is extensible, and we will only need to add new
methods instead of modifying existing ones when a new parameter needs
to be introduced.

Bug: 158736025
Test: presubmit
Change-Id: Iac14af78a7d8dc611800d8f78b7a496f07f74a09
3 files changed