feat: Reduce number of debug_storageRangeAt
calls by precomputing some preimages
#179
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It precomputes preimages for key prefixes of up to five nibbles. This significantly reduces the number of times
debug_storageRangeAt
must be called, as it is now only required if the orphan prefix has at least six nibbles.The resulting lookup table for five nibbles is 8 MB, which seems to be a good compromise.