Multichain and modeling refactor

[vickygos]

Changes

• Refactors and updates library to use proposed interface approved in the following RFC: https://www.notion.so/opensea/Extending-OpenRarity-to-non-EVM-chains-fad5ff855f9c4492aa24d4f3f02b51e6
  (UML Diagram)
  • Updates core models Token and Collection to use the proposed interface that is multichain and interface friendly
  • Creates new interfaces, enums and models: TokenIdentifier
  • Update all tests and resolver logic that assumes the original token/collection model
• Refactors out the resolver logic (which is used to compare rarity ranks across different providers) from the core library interface
  • Previously the resolver logic was oddly modifying the input, whereas in the new system, the input is not modified/touched by the core library -> it just outputs the rank
  • Created new models CollectionWithMetadata and TokenWithRarityData to specifically help with rarity resolvers and comparing rarity
  • Cleanup/Refactor external_rarity_provider, cleaning splitting out independent helper methods with modifiers for comparisons
• Updated the various openrarity scoring algorithms to be sub-classes of Scorer, and updated interface to properly score tokens based on collection + token inputs (and not modify said inputs)
• Did a general cleanup/refactor where it applied, without trying to yak-shave too much....

Open questions:

• What final scoring interface do we want? With current model, the library user would get to decide which scoring strategy to use. However, we may want to provide a wrapper like "OpenRarityScorer" that just uses our chosen scorer option. cc @impreso

For follow-up PRs:

• @impreso to update all unit tests - a lot of the existing ones are incorrect logic
• @vickygos to follow-up on some TODO's mainly removing the count in StringAttributeValue

[impreso]

LGTM left additional feedback, but overall makes sense.