feat: Add update token metadata endpoints

[arcoraven]

Changes

• Add POST /contract/:chain/:contractAddress/erc721/token/update
• Add POST /contract/:chain/:contractAddress/erc1155/token/update

Updates token metadata. Example usage:

curl \
    -H "Authorization: Bearer <REDACTED>" \
    -H "Content-Type: application/json" \
    -H "x-backend-wallet-address: 0x4a1677844da684c840f1780817601fd3db715286" \
    -d '{"tokenId": "0", "metadata": {"name":"Updated NFT title"}}' \
    "http://localhost:3005/contract/80001/0x4B9008ef0176dA2909296B4764344cd2a5E46610/erc721/token/update"

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