feat: add rn accountkit provider

[iykazrji]

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?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR focuses on enhancing the account-kit library, particularly for React Native integration. It introduces new features, improves existing functionalities, and updates documentation for better clarity and usability.

Detailed summary

• Added PAYMASTER_POLICY_ID constant.
• Updated hooks to use twoslash formatting in documentation.
• Introduced new polyfills for buffer, custom-event, mmkv-localstorage, and window.
• Enhanced RNAlchemySigner to support both AlchemyWebSigner and RNAlchemySignerType.
• Updated createAccountKitStore to include documentation.
• Modified useSigner to return AlchemySigner.
• Improved AccountkitProvider for better integration with React Native.
• Added new parameters and improved existing ones in various functions and hooks.
• Updated package dependencies in package.json files for compatibility.

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Screen Recording

screen-20250221-184355.mp4

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	❌ Failed (Inspect)			Feb 21, 2025 11:15pm
aa-sdk-ui-demo	❌ Failed (Inspect)			Feb 21, 2025 11:15pm

[iykazrji]

• feat: add rn accountkit provider #1362 👈 (View in Graphite)
• main

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