Refactor PackageParser (13/n)

Some constants or utils in the PackageParser are still used by the
other classes. This CL moves them into the individual class.

Bug: 174723245
Test: m docs
Test: atest -p core/java/android/content/pm \
        services/core/java/com/android/server/pm
Change-Id: I9b733c8e70ace583055b959daa1cfb5a132ee4a4