Allow PackageManager to retrieve inactive/factory APEXs.

Add functionality to ApexManager to filter the list of all APEX
packages in order to obtain lists of inactive or factory APEXs.
Expose this information to dumpsys.

Test: adb shell dumpsys package
Test: adb shell pm list packages -a --apex-only
Test: atest PackageParserTest
Bug: 123680735
Bug: 119767311
Change-Id: Id8ffe6320b55f647cdf550abfd6703cd868565ff