Create EXTRA_INSTALL_ZIPS variable

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

scripts/Android.bp

@@ -296,3 +296,9 @@ python_binary_host {
     main: "buildinfo.py",
     srcs: ["buildinfo.py"],
 }
+
+python_binary_host {
+    name: "extra_install_zips_file_list",
+    main: "extra_install_zips_file_list.py",
+    srcs: ["extra_install_zips_file_list.py"],
+}