This PR separates ENGINE from Ethbackend. It makes it so:
1) EthBackend not a god class
2) We can abstract away engine API so that we can make it CL-like and
enable Consensus-Execution driven design
3) Objective is Json-RPC -> Engine Consensus Module -> Execution module.
* Fix a typo
* BlockBuilder dummy
* BlockProposerParametersPOS -> BlockBuilderParameters
* Pass tx to MiningStep
* BlockBuilderFunc
* Interrupt in MiningExec Stage
* Draft implementation of BlockBuilder
* Fail back to empty header
* Add a comment
* cosmetic change
* Cosmetic change again
* It's not safe to pass transactions between goroutines
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* ISSUE-2710: Add standard grpc health check to services with grpc server
* Go import changed files
* Add flags for healthcheck
* Add grpc healthcheck option to rpcdaemon
* Remove grpc port info if grpc is not enabled
* Resolve merge issues