feat: Circle Paymaster middleware

[ksmith-circle]

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

This PR introduces a new circlePaymasterMiddleware along with related types and contract helpers for managing Circle Paymaster interactions. It adds address mappings for Circle Paymaster and USDC contracts, enhances the middleware functionality, and implements EIP-2612 permit handling.

Detailed summary

• Added circlePaymasterMiddleware in index.ts.
• Introduced circlePaymasterAddresses and usdcAddresses in addresses.ts.
• Implemented contract interaction helpers in contractHelpers.ts.
• Defined EIP-2612 ABI in permitHelpers.ts.
• Created eip2612Permit function for permit handling.
• Integrated error handling for unsupported EntryPoint versions.

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