Improvements on autofill debugging.

- Sets the client-side sDebug and sVerbose in the application being autofilled
  before it was only set in the service's application
- Logs client class on AutofillManager - useful to detect cases where it's not
  an Activity.

Bug: 67742064
Test: cts-tradefed run commandAndExit cts-dev -m CtsAutoFillServiceTestCases
Test: manual verification of logs

Change-Id: I1f04b90bae89fd942e5849b4a382f1f54df20e38