docs: add USDC Integration guides

[Blessing-Circle]

This PR adds comprehensive documentation for USDC integration with Viem. It introduces a new section under Guides, including the following tutorials:

• USDC Integration (overview and entry page)
• Integrating USDC into Your Application
• Cross-Chain USDC Transfers (CCTP V2)
• Paying Gas with USDC (Circle Paymaster)
• Circle Smart Account

These guides cover basic USDC operations, cross-chain transfers using CCTP, gas abstraction with Circle Paymaster, and smart account setup with Circle Modular Wallets SDK. All code examples use TypeScript and follow Viem documentation style.

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[jxom]

Can you please provide me with access to contribute to your fork?

[Blessing-Circle]

@jxom I have sent you an invite.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

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[Blessing-Circle]

Hi @jxom

Thanks for taking the time to provide comments, and suggestions to the PR. I have resolved all the requests, and I have pushed the updated changes.

Please review at your convenience, and let me know if you have any questions.

Regards