Add custom presentation (RemoteViews) on Dataset values.

New tests on LoginActivityTest:

- testAutofillOneDatasetCustomPresentation()
- testAutofillMultipleDatasetsCustomPresentations()
- testAutofillMultipleDatasetsCustomPresentationSameFields()
- testAutofillMultipleDatasetsCustomPresentationFirstDatasetMissingSecondField()
- testAutofillMultipleDatasetsCustomPresentationSecondDatasetMissingFirstField()

Fixes: 36067706
Test: CtsAutoFillServiceTestCases pass

Change-Id: Iacb660bf5a5cf311dea4bfcbfe1b3722aab34715