Create a rarity score logic that both work onchain and offchain

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• Write two variant on how to calculate and display rarity score.
• Should consider the nature of dynamic NFT so the score needs to be mutable.

Resources:
https://hedera.com/learning/nfts/nft-rarity

[Reblixt]

Docs for sharing the findings:
https://docs.google.com/document/d/1kcCEobR7kDEbX16VoLVypFbPKxOPmXWjJM48FWlv0a8/edit?usp=sharing