[3.13] gh-131531: Add `android.py package` command (GH-131532) (#131960)

Adds a `package` entry point to the `android.py` build script to support
creating an Android distribution artefact.
(cherry picked from commit fe5c4c53e7bc6d780686013eaab17de2237b2176)

Co-authored-by: Malcolm Smith <smith@chaquo.com>