Improve agw-client README examples and paymaster usage

[0x4tl4nt]

Description

Updated examples in packages/agw-client/README.md to improve correctness, consistency, and usability.

1. Removed unused and potentially incorrect ChainEIP712 import from viem.
2. Aligned type usage with the rest of the package (viem/zksync).
3. Replaced placeholder paymasterInput: '0x' with a working example using getGeneralPaymasterInput
4. Clarified paymaster usage in sendTransaction (fields instead of a single object).
5. Improved example readability and structure (headings, links, formatting).

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PR-Codex overview

This PR focuses on updating the README.md for the agw-client package by modifying the way paymasterInput is handled in the transaction process and clarifying the explanation of Paymaster usage.

Detailed summary

• Removed the import of ChainEIP712 from viem.
• Added import of getGeneralPaymasterInput from viem/zksync.
• Updated paymasterInput to use getGeneralPaymasterInput({ innerInput: '0x' }).
• Clarified the explanation of Paymaster usage in the documentation.

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[cursor]

PR Summary

Low Risk
Documentation-only changes, mainly correcting code snippets for paymaster inputs and imports; no runtime code paths are modified.

Overview
Updates packages/agw-client/README.md examples for correctness by removing the unused ChainEIP712 import and switching the paymaster snippet to use getGeneralPaymasterInput (instead of a placeholder '0x'). Also clarifies that sendTransaction takes paymaster and paymasterInput fields directly when describing sponsored transactions.

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Latest commit: 11f5bb7

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