Adding option to add/remove multiple splits in a single call.

Primary goal is to reduce number of adb shell/cmd/abb calls required to
manage split installations.
Secondary goal is to prepare for new callback-based apis as they are
more efficient for batch changes.

- install - can install multiple splits for an app,
- uninstall - can remove multiple splits,
- install-remove - documented and added option to remove multiple
splits.

Test: atest PackageManagerShellCommandTest
Change-Id: I6fec5ebf9203c8e2e581c3044f62d7de0aa7d414