Create Stats entity

[vikiival]

What if we can calculate the stats on demand?

[vikiival]

Fast draft for the collection stats

type CollectionStat @entity {
  id: ID!
  alreadyMinted: Int!
  collection: CollectionEntity!
  uniqueOwners: [UniqueOwner]!
  volumes: [Volume]!
  listed: Int!
  score: Int!
  totalVolume: BigInt!
}

type Volume @entity {
  id: ID!
  collection: Collection!
  date: Date!
  amount: BigInt!
}

type UniqueOwner @jsonField {
  owner: String!
  count: Int!
}