* gossip: notify state machine of duplicate proofs
* Add feature flag for ingesting duplicate proofs from Gossip.
* Use the Epoch the shred is in instead of the root bank epoch.
* Fix unittest by activating the feature.
* Add a test for feature disabled case.
* EpochSchedule is now not copyable, clone it explicitly.
* pr feedback: read epoch schedule on startup, add guard for ff recache
* pr feedback: bank_forks lock, -cached_slots_in_epoch, init ff
* pr feedback: bank.forks_try_read() -> read()
* pr feedback: fix local-cluster setup
* local-cluster: do not expose gossip internals, use retry mechanism instead
* local-cluster: split out case 4b into separate test and ignore
* pr feedback: avoid taking lock if ff is already found
* pr feedback: do not cache ff epoch
* pr feedback: bank_forks lock, revert to cached_slots_in_epoch
* pr feedback: move local variable into helper function
* pr feedback: use let else, remove epoch 0 hack
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Co-authored-by: Wen <crocoxu@gmail.com>
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