Set producer planned downtime (#472)

* Set producer planned downtime

* Added unit tests for set producer downtime tx

* Fix lint

* Added offset infront of start timestamp for planned downtime

* Set producer downtime with short notice

* Reworked producer downtime tx

* Fix Veblop tests

* Remove tests for old implementation of SetProducerDowntime

* Remove redundant check for SetProducerDowntime HF

* Added unit tests

* Fix lint

* Fix SetProducerDowntime tx cli

* Fix SetProducerDowntime tx cli

* Fix SetProducerDowntime HF check

* Added logging of RawLog when tx fails

* Allow overriding existing planned downtime

* Change min downtime range

* Added metrics for SetProducerDowntime

* Added autocli for GetProducerPlannedDowntime

* Finalize SetProducerDowntime

* SetProducerDowntime - fix producer address comparison

* SetProducerDowntime - fix producer address comparison

* Rework PostHandler for SetProducerDowntime

* Fix lint

* Add calcOnly flag for SetProducerDowntime tx

* SetProducerDowntime - check early if producer

* Fix lint

* Added HF checks for introducing 4th producer

* Fix lint

* Move GetProducerSetLimit to helper config

* Added new producers IDs

* Limit fallback producers based on producerSetLimit

* Increase span rotation thresholds

* Added HF check for SetProducerDowntime

* Fix build

* Fix lint

* Fix context

* Fix HF check for SetProducerDowntime

* Fix duplicated sdk.Context usage

* Fix minimum time in future check for SideHandleSetProducerDowntime

* Fix error message

* Fix HF check in CheckTx

* Add HF check for ChangeProducerThreshold and SpanRotationBuffer

* Fix cli flags type

* Removed FlagChainID from cli

* Added check for zero average block time

* Added checks for timestamp in past

* Refactor based on comments

* Fix tests

* Filter MsgSetProducerDowntime before HF

* Set Amoy HF height

* Set Amoy HF height

* Update Amoy default producers

Author: avalkov