refactor(rn): clean things up so they're more digestable

[moldy530]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
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PR-Codex overview

This PR focuses on refactoring the account-kit/rn-signer codebase, enhancing the RNSignerClient functionality, and updating the Android integration for better key management and security protocols. It also modifies example usage and improves configuration files.

Detailed summary

• Removed NativeTEKStamper and replaced with RNSignerClient.
• Updated package.json dependencies.
• Added new files for HPKE key management in Android.
• Enhanced .env setup instructions in README.md.
• Modified Metro configuration to include additional watch folders.
• Updated yarn.lock with new package versions.
• Refactored methods in NativeTEKStamperModule for better clarity and security.

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[moldy530]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• chore: update github actions for rn #1144
• refactor(rn): clean things up so they're more digestable #1134 👈 (View in Graphite)
• chore(rn): create example from template #1128 : 1 other dependent PR (#1129 )
• main

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[dphilipson]

Looks great! Some Kotlin nitpicks, but should be good to go.