chore: update wallet-api openrpc schema

[Richard-Dang]

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)
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PR-Codex overview

This PR focuses on enhancing the wallet-api.yaml schema by improving validation patterns, adding error messages, and refining object structures to ensure proper Ethereum address and UUID formats.

Detailed summary

• Updated regex patterns for Ethereum addresses to ensure they start with 0x.
• Added error messages for invalid Ethereum addresses and UUIDs.
• Defined required fields such as signerAddress, accountType, and accountAddress.
• Enhanced descriptions for various properties to clarify usage.
• Introduced new required fields in several objects, including factoryType and factoryAddress.
• Structured signatureRequest and feePayment objects with clearer requirements and descriptions.
• Improved multi-owner and single-owner account type definitions with error handling.
• Consolidated and clarified the purpose of paymaster and erc20 settings.

The following files were skipped due to too many changes: docs/specs/openrpc/wallet-api/wallet-api.yaml

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