[proposal] add react-native test harness for Veramo core and some plugins

[mirceanis]

Veramo is missing an automated way of checking which packages work in a react-native environment.

We need a sample repository with a react-native app that uses @veramo/core and a few veramo plugins and runs through some methods of the plugins as an integration test. Ideally, the mobile app should mimic the steps from one of the guides.

The solution should contain github workflows that download the latest relevant @veramo/* packages, build the app and then run it in an Android emulator to check that everything works. The solution can be either a separate repository or a PR to this repository with a folder containing the required setup.

This relates to #372