Create new AIDL objects for retrieving information about staged apex

Native clients will be communicating with PackageManagerNative service
for information regarding staged apex packages.

Bug: 187444679
Test: see ag/15462076
Change-Id: If9a4ec3586a23f83229d5fdce271bf69d9073134
Merged-In: If9a4ec3586a23f83229d5fdce271bf69d9073134
(cherry picked from commit 042261d2)