Index Token Standard on Metadata

[kespinola]

Goal

The token standard and uses of the metadata are indexed and exposed through the API.

References

https://github.com/metaplex-foundation/metaplex-program-library/blob/master/token-metadata/program/src/state/metadata.rs#L45
https://github.com/metaplex-foundation/metaplex-program-library/blob/master/token-metadata/program/src/state/metadata.rs#L265

https://metaplex.notion.site/Public-FAQ-A-new-asset-class-to-enforce-royalties-4662d26ee8af451faeb16d6a0534cb70

[kespinola]

@imabdulbasit can you adjust the API to surface token standard on the NFT object?

https://docs.holaplex.com/#definition-Nft

[kespinola]

done.