NewFinalizationActor creates a new FinalizationActor, and returns the worker routine and event consumer required to operate it.

NewFinalizedHeaderCache returns a new FinalizedHeaderCache and the ComponentWorker function.

FinalizationActor is an event responder worker which can be embedded in a component to simplify the plumbing required to respond to block finalization events.

FinalizedHeaderCache caches a copy of the most recently finalized block header by consuming BlockFinalized events from HotStuff, using a FinalizationActor.

ProcessLatestFinalizedBlock is invoked when a new block is finalized.