Update API: initial support

Initial pieces of the Update API callback framework.

- move the status callback params to a new object, UpdateEngineStatus to
allow for the easier addition of new params in the future.
- switch the IUpdateEngineStatusCallback to provide a
ParcelableUpdateEngineStatus instead of a series of individual params
- move the various GetStatus() methods to use the UpdateEngineStatus
object instead of a series of params (which will need future expansion)
- Add current and new product/os versions to both the UpdateEngineStatus
and the ParcelableUpdateEngineStatus.

Bug: 64808702
Test: unit tests, and performing OTAs via a test app calling
  IUpdateEngine::AttemptUpdate() via UpdateManager::performUpdateNow()

Change-Id: I53f66f3511049f0809855814e1e758023cd8cc08
(cherry picked from commit 4f96ebf85022837603f2e10100a044d234b7d86f)
diff --git a/binder_bindings/android/brillo/IUpdateEngineStatusCallback.aidl b/binder_bindings/android/brillo/IUpdateEngineStatusCallback.aidl
index 42b6438..837d44d 100644
--- a/binder_bindings/android/brillo/IUpdateEngineStatusCallback.aidl
+++ b/binder_bindings/android/brillo/IUpdateEngineStatusCallback.aidl
@@ -16,8 +16,9 @@
 
 package android.brillo;
 
+import android.brillo.ParcelableUpdateEngineStatus;
+
 interface IUpdateEngineStatusCallback {
   oneway
-  void HandleStatusUpdate(in long last_checked_time, in double progress,
-      in String current_operation, in String new_version, in long new_size);
+  void HandleStatusUpdate(in ParcelableUpdateEngineStatus status);
 }