Some tools (nanopb) launch python using `py -3`. Pigweed doesn't
provide a full py launcher, so this is a stopgap change to add a
stub that should support scripts that launch python using the py
launcher.
Change-Id: Ibed1ae2ca79ef3c9698056c04110a1ab82d825c7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/24022
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Anthony DiGirolamo <tonymd@google.com>
Pigweed-Auto-Submit: Armando Montanez <montanez.armando.l@gmail.com>
