Trigger a bugreport directly from shell

Send broadcast to shell, so that it makes a call to bugreport API
directly.

Permission protected call is made so that not any app can send this
broadcast intent to shell.

Use Settings feature flag to turn on this workflow and leave the old workflow
untouched.

Bug: 123617758

Test: build and manual test by triggering bugreports from the device
Change-Id: Iec43fa1e5e379e2f5520a48f7fe036d59e2a8d28