Massive storage trees #73
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This PR introduces a notion of a massive storage tree. Usually, for accounts that have a small number of storage slots occupied, the entries are kept in
FixedMapin the page, just beside the account data. When a page is mostly filled with storage slots of the given account though, Paprika optimizes it by planting a new tree responsible for storing information only about the storage slots for the given account. This, for accounts with millions of slots occupied is a game changer.