Add hard fork genesis delta config parameter #17931
Merged
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The hard_fork_genesis_slot_delta option tracks the slot span between the slot_chain_end and the planned proof.fork.global_slot_since_genesis of an upcoming hard fork. In a future commit it will be incorporated into the hard fork account migration and the root ledger sync mechanism.
It can't quite be used in the ledger sync code yet (for the vesting parameter adjustment) because the structure of the ledger root code assumes that the conversion function can be determined at compile time. I'll change the converting merkle tree code (or the root code) slightly to compensate in a later update.