Make needs to know the primary file, because the zip is only extracted
when the primary file is installed.
Bug: 337869220
Test: m out/target/product/emu64x/obj/PACKAGING/system_intermediates/file_list.txt and checking it for the extra NetworkStackGoogle apks, with a local NetworkStackGoogle android_app_set added into the tree
Change-Id: I5cb7243d214f4730e3f9efb6746793f3bf4b8214
Make needs to know about the "extra" zip files that are extracted
to the staging directories so that it can track all the installed files
correctly.
Also add a utility tool for listing the contents of relevant zips.
Bug: 337869220
Test: m droid and checked the contents of file_list.txt when adding an android_app_set locally
Change-Id: Idc5dd785b03c05f7972c66620d4e6359892b3863