fix: walletconnect sign raw

[jakehobbs]

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PR-Codex overview

This PR focuses on updating the signMessage method in the WalletClientSigner class to handle different message formats, specifically ensuring compatibility with Wallet Connect by supporting string messages and converting raw byte messages to hex.

Detailed summary

• Modified the signMessage method to handle messages as strings.
• Added a conditional check to determine the message format:
  • If the message is a string, it is used directly.
  • If the message has a raw property that is a string, it is used.
  • Otherwise, raw is converted to hex using bytesToHex.

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[jakehobbs]

Closing this as it's not actually the issue.