Update PackageInstaller install handing

* Allow forcing permission check. We want to modify the PackageInstaller to
use the PackageInstallerSession for better security / remove deprecated APIs.
In order to do this and continue to prompt for permissions, we need to prevent
the PakcageInstaller from auto-approving the permissions.

* Add originating UID to SessionParams. This is used for package verifier
checks.

Bug: 22282121
Change-Id: I19079749d20ace66f1332f399d52cb0fb8784cd9