Refactored Field Classification score logic so it can be moved to ExtServices.

Bug: 70939974
Test: atest CtsAutoFillServiceTestCases:FieldsClassificationTest \
            CtsAutoFillServiceTestCases:UserDataTest
Test: atest CtsAutoFillServiceTestCases

Change-Id: If584ab3a55744a62f427065bfd44c8c219df83e9
14 files changed