Adding FileSystemUtils test

Adding tests to check whether apps can be launched after
loading the punched libs. One app has uncompressed shared lib which
will be directly loaded from apk and other will extract it.

Test: acloud delete --all && m && acloud create --local-instance --local-image && adb logcat -c && m FileSystemUtilsTests && atest -c FileSystemUtilsTests
Bug: 301631861
Change-Id: I4f7b38902f2e02e83a350cd1cc907f8edaa20c81