Remove ParsingPackageRead

This was only really in effect for one signatures utility, but makes the
interface hierarchy much more confusing, so this removes it and just readjusts
the utility to take in different types.

Test: atest AppsFilterImplTest
Test: atest PackageManagerTests
Test: atest PackageParserTest
Test: atest PackageParserLegacyCoreTest
Test: atest PackageParsingDeferErrorTest
Test: atest AppIntegrityManagerServiceImplTest
Test: atest GtsAppIntegrityManagerTests
Test: atest CtsAppIntegrityDeviceTestCases

Change-Id: I59c0a7ed2237b2c094fe8088f853ca0ddc80ee97