Move ClockworkPackageInstaller functionality here

- The code is being moved from
https://cs.corp.google.com/#android/vendor/google_clockwork/packages/PackageInstaller/src/com/google/android/clockwork/packageinstaller/

Bug: 22411517

Change-Id: If6a0b7f49530176a6cff6b76ee6eff44ba822547
5 files changed