Catch all exceptions in AutofillManagerService methods.

This prevents exceptions from propagating, which
would have resulted in Autofill server timing out, which would cause various apps to ANR.

Bug: 278209634
Fixes: 285041619
Test: atest CtsAutoFillServiceTestCases
Change-Id: Ia2afd2e483587796ed62b32bc0aba1bc48b371f9