[Autofill PCC]: API for setting all types

Introduce API to set field that's applicable to any detection type.
In the absence of this, providers would've to set helper hints for
all types.
Test: atest
android.autofillservice.cts.unittests.DatasetTest
android.autofillservice.cts.inline.InlineLoginActivityTest
android.autofillservice.cts.dropdown.LoginActivityTest
android.autofillservice.cts.dialog.LoginActivityTest

BUG: 271346008

Change-Id: I1429cd465cf9458f18b7a460557cca2f5b42b582