Minor fixes from using package outside of a mono-repo

[kraenhansen]

Merging this PR will:

• Delete the hermes clone using async fs operations
• Make the React Native directory resolve relative to the app package root when patching JSI from our patched Hermes.
• Add the fallback entrypoint for our "babel-plugin" to the "files" in the package.json.
• Add react-native@0.79.2 as a supported peer dependency (because its Hermes tag hasn't changed since 0.79.1).

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[matthargett]

some minor comments/suggestions. did you test on a Android app non-monorepo in a Windows cmd/powershell enviroment?

[kraenhansen]

did you test on a Android app non-monorepo in a Windows cmd/powershell enviroment?

I did not and I agree, we should probably do a pass trying consume this from Windows (soon -ish).