feat: add oauth support to react native signer

[iykazrji]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
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PR-Codex overview

This PR primarily enhances the OAuth functionality within the account-kit library, introducing new error handling, utility functions, and improved integration with the In-App Browser. It also refines existing components and adds support for new OAuth providers.

Detailed summary

• Added Buffer polyfill in buffer-polyfill.ts.
• Introduced resolveRelativeUrl utility function.
• Enhanced OAuthProvidersError and added InAppBrowserUnavailableError.
• Implemented oauthWithRedirect and oauthWithPopup methods in RNSignerClient.
• Updated RNAlchemySigner to include OAuth functionalities.
• Created OAuthScreen for user authentication via OAuth.
• Added getOauthProviderUrl utility for generating OAuth URLs.
• Removed outdated nonce generation logic from oauth.ts.
• Updated package.json files to include new dependencies and versions.

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[iykazrji]

• feat: add oauth support to react native signer #1273 👈 (View in Graphite)
• main

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[moldy530]

couple small comments, but generally LGTM

[moldy530]

we shouldn't be ignoring these. I'm actually shocked it's building with these 🤔

does it not work if these are ... from "./signer.js"

[iykazrji]

Yeah, so specifying the extension seems to throw Metro off and prevents the example apps from building, hence we removed the extension from this export.