added config plugin

[jzviaginSingular]

Title and description

Add a config plugin for expo, to avoid manually modifying manifest file and build.gradle

Type of change

Check the relevant option:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] API changes (requires wrappers implementation)
• [ ] This change requires a documentation update

Details

In some expo build pipelines (like EAS) there is no chance to modify generated native code (manifest, build.gradle) A config plugin was added to perform those actions automatically as described here:

https://docs.expo.dev/config-plugins/introduction/

How Has This Been Tested?

Tested basic functionality with a newly created Expo app with build using EAS for ios and android

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation - if relevant
• [x] I have added tests that cover new code or fix
• [x] Existing unit tests pass locally with my changes
• [x] Relevant code added to testing app - if relevant