Make sandboxContext extend LauncherApplication (4/n)

See
https://docs.google.com/drawings/d/1JHFi_nhmQt2xPT1N3FB_1mnaRK5TVqKZ9-fSl3EA7sU/edit?usp=sharing
and
https://docs.google.com/drawings/d/1bx4WURP4uHZGzZ1bWQgpw701jkTkVqlNfA02Yt-ZtSI/edit?usp=sharing&resourcekey=0-oySjsnaCsOSrNIPqqEa0gw
for design details.

We need to make SandboxContext extend LauncherApplication because we
want create MainThreadInitializedObjects in SandboxContext's
AppComponent scope. Since MainThreadInitiliazedObjects are closed in
SandboxContext's OnDestroy() , we need to replicate same thing using
dagger as well.

- DaggerSingletonObject is same as MainThreadInitializedObject but is
  used for fetching the dagger created singletons so that we can avoid
  major refactors for accessing singletons. This will be deleted soon.

- DaggerSingletonTracker to track dagger created singletons and call
  close() on those singleton objects created in SandboxContext scope.

- Annotate the singleton object SettingsChangeLogger constructor with @Inject and execute the statements in Main thread.
- Added createSandboxContextForTest(only for Test) to avoid creation of
  dagger component in test. As follow up, I will delete this method and
  introduce fakeDaggerComponents in test.

Bug: 361850561
Test: Manual
Flag: NONE Dagger Integration

Change-Id: I2d3762ea64e53baa4de190790568aec750b54201