chore: Update ERC721 mint-to to v5

[arcoraven]

PR-Codex overview

This PR focuses on updating the erc721mintTo function in the mintTo.ts file to integrate the thirdweb SDK for minting NFTs, enhancing the transaction handling and improving input validation.

Detailed summary

• Replaced local getContract and queueTx imports with thirdweb SDK functions.
• Updated the transaction preparation to use mintTo from thirdweb/extensions/erc721.
• Added backward compatibility for metadata handling.
• Changed request header variable names for clarity.
• Improved input validation with maybeAddress and requiredAddress functions.

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