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

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](https://veramo.io/docs/react_native_tutorials/react_native_setup_identifers).

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