[Storehouse] 005 Payloadless View Committer

[zhangchiqing]

• Add Payloadless View Committer. It's different from the original View committer as it creates proof by retrieving the payloadless proof from payloadless trie, and retrieve payload value from storehouse, and then verify the leaf hash and reconstruct the proof.
  See Spec

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[zhangchiqing]

valueReader is the storehouse. Reconstructing the proof happens in the ProveAndReconstruct functions, it also verifies the payload value retrieved from valueReader matches the leafHash from the payloadless trie.