Added creatorDid and attributes fields (HIP412 validation) #43
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## Overview
This added 2 additional HIP412 to metadata validation:
The creatorDid is supposed to be a chain agnostic decentralized identifier, we don't validate the format of the DID.
The attributes field is akin to opensea NFT standards, an array of objects (you may add whatever details you want)
Notes
Both of these fields are hidden in the spec and not part of the Formal JSON Schema Definition of the HIP 🙃