New autofill API: let service explicitly set dataset filter.

Test: cts-tradefed run commandAndExit cts-dev -m CtsAutoFillServiceTestCases -t android.autofillservice.cts.LoginActivityTest#filterTextUsingRegex
Test: cts-tradefed run commandAndExit cts-dev -m CtsAutoFillServiceTestCases -t android.autofillservice.cts.LoginActivityTest#testDatasetAuthFilteringUsingRegex
Test: cts-tradefed run commandAndExit cts-dev -m CtsAutoFillServiceTestCases -t android.autofillservice.cts.DatasetTest
Test: cts-tradefed run commandAndExit cts-dev -m CtsAutoFillServiceTestCases
Test: ran 'm -j doc-comment-check-docs' and checked resulting HTML

Fixes: 67314013

Change-Id: I4412c1bf650219d005b9287033b463de6aee764d