ERC-6492 sig utils

[wilsoncusack]

Utils here are intended to help apps parse signature in the post ERC-6492 world. For offchain verification, Viem's verifyMessage is great. But for onchain, apps will need to parse out just the signed data to use for the ERC-1271 call onchain.

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PR-Codex overview

This PR introduces ERC-6492 signature utilities, deprecates old signature functions, updates signature handling across multiple files, and improves documentation.

Detailed summary

• Added ERC-6492 signature utilities: isErc6492Signature, parseErc6492Signature, serializeErc6492Signature
• Deprecated old signature functions
• Updated signature handling in various files
• Improved documentation for serializeSignature function

The following files were skipped due to too many changes: src/utils/signature/recoverTransactionAddress.test.ts, site/pages/docs/utilities/hexToSignature.md, site/pages/docs/utilities/compactSignatureToHex.md, site/pages/docs/utilities/hexToCompactSignature.md, src/utils/signature/hexToSignature.ts, src/actions/public/verifyHash.test.ts, src/utils/signature/serializeErc6492Signature.test.ts, src/utils/signature/compactSignatureToHex.ts, site/pages/docs/utilities/isErc6492Signature.md, src/utils/signature/signatureToHex.test.ts, src/utils/signature/parseERC6492Signature.test.ts, site/sidebar.ts, src/utils/signature/signatureToHex.ts, src/utils/signature/hexToCompactSignature.ts, src/utils/signature/recoverAddress.test.ts, site/pages/docs/utilities/parseErc6492Signature.md, site/pages/docs/utilities/serializeErc6492Signature.md, src/utils/signature/serializeErc6492Signature.ts, src/utils/signature/recoverPublicKey.test.ts, src/utils/signature/hexToSignature.test.ts, src/utils/signature/parseERC6492Signature.ts, src/index.ts

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🦋 Changeset detected

Latest commit: 395a291

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
viem	Minor

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