feat: add parent blockstate to blockstate #9755
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ref #9614
This transforms the BlockState type into a linked list that references the parent block, this way we can trace the chain back to the block that is supposed to be on disk.
updating this from the tree pov would also be simple, because we only need to insert a new entry per block and pop the persisted blocks from the in memory list so that the other blocks now point to a higher block on disk