do not create new token if it already exists (deterministic instantiation)

[peersky]

this is reopened #56

WIth completion of #62 it is now possible to create multiple subjects that correspond to different Rank NFT asset minting privilege.

As we go forward, this brings a ux question of supplorting multiple subjects with absolutely identical subject. Technically right now it is possible, to create two Rank Token NFTs, with identical subject.

With this ticket, we want to create token such that it can work for every subject, but will avoid duplication of Rank NFTs.

This means that there will be one Rank NFT endpoint that can mint tokens for unlimited number of instances. Following is needed:

• MAO Distribution instantiate workflow should be able to recognize already existing instance and attach to it another instance
• In case of same subject, must ensure it can align common parameters following ACID framework.
• In case of same subject, must emit indexable event that allows to group instances.
• Must ensure multiple distributed instances can mint Rank NFT of same token

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