BFT Block Puller: in orderer

[tock-ibm]

Use BFT block deliverer relevant components in the orderer chain + follower

• Block receiver

• Censorship monitor

• Config updated dynamically

• Orderer source addresses updated dynamically

• Detect the self endpoint

• Allow the orderer to choose a block-replication-policy: between a naive scheme (existing) and the BFT resistant scheme

• Allow the BFTDeliverer to skip the self endpoint when pulling blocks

• Implement the BFT resistant scheme into a new BFT synchronizer

• Target height selection:
  (1) simple (based on height by endpoints and F),
  (2) optimistic (based on verifying the last block from each orderer, selecting max height from those that verify). Deferred to a separate issue BFT Block Puller: optimistic target height selection #4698 .