Modify the RuleBinarySerializer to identify the indexes per block.

This change required some changes in RuleIndexingDetailsIdentifier. Note
that this change caused some noop changes in RuleXmlSerializer.

A change to write the identified rules will be send separately as a
follow up.

Bug: 145493956
Test: atest FrameworksServicesTests:RuleIndexingDetailsIdentifierTest
Change-Id: Ia1ff123325b3a5226ece29f2377db900c17569ae