[Perf] Cache the block tree on shutdown #4017
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This is the snarkOS counterpart to ProvableHQ/snarkVM#3030, targeting ProvableHQ/snarkVM#3026.
I've successfully run some local tests using it, and saving the block tree seems to work most of the time; I'll soon iron out some edge case that I've observed from time to time (with the worst case scenario being the status quo, i.e. a full rebuild of the block tree).
Filing as a draft, as it uses an external branch until the snarkVM changes are merged, plus that one edge case.