[SDK] fix: Separate properties and attributes in NFTInput

[yukia3e]

Changes

• Linear: https://linear.app/thirdweb/issue/INF-171/
• In the existing metadata transformation logic, properties and attributes were treated interchangeably (properties: metadata.properties || metadata.attributes). However, these fields serve different purposes and should be handled separately to avoid potential data conflicts and maintain clarity.
• Updated the logic to explicitly set properties and attributes as independent fields in the NFT metadata transformation.

How this PR will be tested

• Open the dashboard and click X. Result: A modal should appear.
• Call the /foo/bar API. Result: Returns 200 with "baz" in the response body.

Output

(Example: Screenshot/GIF for UI changes, cURL output for API changes)

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PR-Codex overview

This PR focuses on updating the handling of properties and attributes in the mint-to.ts files for both erc721 and erc1155 contracts. The changes ensure that properties and attributes are set to undefined if they are not present in the metadata.

Detailed summary

• Changed properties assignment from metadata.properties || metadata.attributes to metadata.properties ?? undefined.
• Added attributes assignment with metadata.attributes ?? undefined in both erc721 and erc1155 files.

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[github-actions]

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[joaquim-verges]

thank you @yukia3e !