Frameworks/base: Add new flow to OtaDexoptService

Add functionality to capture/intercept installd communication, and
use this to return the full communication for dexopt. These parameters
can be used to drive otapreopt_chroot directly.

Keep the old direct invocation alive until devices have transitioned
to a service that exposes this API.

In preparation for renaming of A/B OTA artifacts to include target
slot names.

Bug: 25612095
Bug: 28069686
Change-Id: I14728ee1266f3882cada8f08dd21891ed5f7a0cb