feat: add 7702 UO into demo app

[linnall]

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)
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PR-Codex overview

This PR introduces functionality for handling transactions using a public client and bundler client in the useTransaction hook. It sets up the necessary clients and sends a transaction using a local account signer.

Detailed summary

• Added imports for createPublicClient, mekong, splitMekongTransport, and @aa-sdk/core.
• Created a publicClient using createPublicClient.
• Created a bundlerClient from the publicClient.
• Converted a private key to an account with privateKeyToAccount.
• Called send7702UO to initiate a transaction using the bundlerClient and LocalAccountSigner.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 11, 2025 1:22am
aa-sdk-ui-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 11, 2025 1:22am

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