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PR description
This PR adds a new StoredVerkleTrie class representing a VerkleTrie where Nodes can be fetched from storage as needed while walking through the Trie.
Currently, there is a SimpleVerkleTrie which can be constructed in memory only, and there is a StoredNodeFactory which can retrieve a single node from storage. However, there was no mechanism to walk a VerkleTrie where nodes are stored in storage. StoredVerkleTrie fills this gap.