fast leader handover: populate ParentMeta children
#606
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Problem and Summary of Changes
During Alpenglow, validators will receive
BlockComponents which will result in a changing parent:BlockHeader: sets the initial block parentUpdateParent: switches the parent according to Alpenglow fast leader handover protocolThese components currently fit within one shred each. On each shred's arrival, we need to maintain the full tree of parent and children relationships. While
ParentMetamaintains parent relationships, this PR introduces children relationships, essential forgenerate_new_bank_forks.In addition to extending
ParentMetawith achildrenfield, we introduce aPendingNextSlotsMetacolumn to track children for blocks awaiting parent metadata, i.e., blocks that aren't yet in theParentMetacolumn.