Register social mesh research app's signing key and package name with Google Play
If we plan to develop a research app as part of #1816 (closed), register the package name and app signing key with Google Play before the end of July 2021 so we're not required to let Google manage the signing key.
https://android-developers.googleblog.com/2020/11/new-android-app-bundle-and-target-api.html
Subtask of #1816 (closed).