Fix: SPGNFT metadata hash setter

[romain-mg]

Description

This PR adds functionality to allow NFT owners to update the metadata (both URI and hash) of their tokens in SPGNFT collections.

Changes Made

Core Functionality

• Added setTokenURI(uint256 tokenId, string memory tokenUri, bytes32 nftMetadataHash) external function in SPGNFT.sol -> allows token owners to update both metadata URI and metadata hash for their tokens
• Validates caller is the token owner using ownerOf() check
• Calls _setTokenURI() to update the token's URI
• Updates the nftMetadataHashToTokenId mapping

Interface Updates

• Added setTokenURI(uint256 tokenId, string memory tokenUri, bytes32 nftMetadataHash) function declaration in ISPGNFT.sol
• Marked the existing setTokenURI(uint256 tokenId, string memory tokenUri) function as deprecated

Error Handling

• Reuses existing SPGNFT__CallerNotOwner error for access control validation

Testing

• Added comprehensive test coverage in SPGNFT.t.sol:
• test_SPGNFT_setTokenURI() - successful metadata update (both URI and hash)
• test_SPGNFT_setTokenURI_revert_callerNotOwner() - access control validation
• Marked the tests of the old existing setTokenURI() function as deprecated, avoiding duplicated tests issues

Related Issues

Closes #232

[sebsadface]

LGTM