Accept a URI for bugreport and screenshot paths to be forwarded to BugreportManager API.

This is limited to bugreports of type wear.

Bug: b/378481755
Test: Manually tested Shell can successfully create a BR and forward the result to WearServices
Flag: com.android.shell.flags.handle_bugreports_for_wear

Change-Id: Ic3cf472750389333f8befe9dc13adc187947aa90