feat: add erc20Context to sdk

[andysim3d]

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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tested on chain:

With Permit:
https://sepolia.etherscan.io/tx/0x57fc8bae157a9b45068d45de503f3f841c5f15732c4e8bf47f1e3ee4e09d26b3

Without Permit:
https://sepolia.etherscan.io/tx/0xd0dc1b2f8ea6255db3e103eeca052598ff2b06f9cbb9e7a76bc9d4d064fdf85e

---

PR-Codex overview

This PR introduces enhancements to the handling of ERC20 tokens within the Alchemy Smart Account Client, adding support for policy tokens, permit types, and related middleware adjustments for gas management.

Detailed summary

• Added erc20Context to types.ts for token management.
• Introduced policyToken in smartAccountClient.ts for ERC20 token details.
• Updated alchemyGasAndPaymasterAndDataMiddleware to handle policyToken.
• Defined PermitTypes, EIP712NoncesAbi, PermitMessage, and PermitDomain in gas-manager.ts.
• Enhanced middleware to manage ERC20 permits and gas requests.

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[jakehobbs]

lgtm!