Consider backing off if RequestBroadcast errors

[masih]

The GPBFT implementation here silently logs errors that occur as a result of requesting broadcast.

In practice, if such situations occur it may be better to backoff from sending consecutive requests, e.g. that may be caused by pubsub congestion.

Using a circuit breaker pattern at host implementation in f3 package might just do the trick without the need for larger refactor across the core gpbft package/protocol changes.

Originally posted by @Stebalien in #627 (comment)

[rjan90]

2024-09-09: Discussed in the daily sync that it is lower on the priority list and therefore I will not assign Milestone 2: Hardening and Mainnet Deployment Readiness to this ticket. Might be revisited during the colo