[ETCM-759] Refactor mining by adding a PowMiningCoordinator that handles both Ethash and Keccak mining coordination

* [ETCM-759] Rename EthashBlockCreator to PoWBlockCreator
* [ETCM-759] Rename MinerResponse to MockedMinerResponse
* [ETCM-759] Add PoWMiningCoordinator
* [ETCM-759] Update PowConsensus to use new PoWMiningCoordinator instead of EthashMiner. PoWMiningCoordinator is a typed actor and MockedMiner is a classic actor, that's the reason for the extra code added.
* [ETCM-759] Modify EthashMiner to only mine on demand, managed by the PoWMiningManager
* [ETCM-759] Extract code to mining with Keccak into an actor called KeccakMiner. (Mining on demand, managed by the PoWMiningManager)
* [ETCM-759] Adjust MinerSpecSetup to contain shared setup between mock, keccak, ethash miners and the coordinator
* [ETCM-759] Rename PoWMinerCooordinatorSpec to PoWMiningCoordinatorSpec
* [ETCM-759] Add assertion in Ethash and Keccak miners spec
M-759] Fix PoWMiningCoordinatorSpec
* [ETCM-759] Renamed DoMining to MineNext in PoWMiningCoordinator
* [ETCM-759] Rename StartMining(mode: MiningMode) to SetMiningMode((mode: MiningMode)) in PoWMiningCoordinator

Author: Leonor Boga

project/Dependencies.scala

@@ -13,6 +13,7 @@ object Dependencies {
   val akka: Seq[ModuleID] = {
     Seq(
       "com.typesafe.akka" %% "akka-actor" % akkaVersion,
+      "com.typesafe.akka" %% "akka-actor-typed" % akkaVersion,
       "com.typesafe.akka" %% "akka-slf4j" % akkaVersion,
       "com.typesafe.akka" %% "akka-actor-typed" % akkaVersion,
       "com.typesafe.akka" %% "akka-testkit" % akkaVersion,

src/main/resources/conf/pottery.conf

@@ -15,8 +15,8 @@ mantis {
 
 	consensus {
     coinbase = "0011223344556677889900112233445566778899" # has to be changed for each node
-    mining-enabled = false
-    protocol = "restricted-ethash"
+    mining-enabled = true
+    protocol = "restricted-pow"
   }
 
 	metrics {

src/main/scala/io/iohk/ethereum/consensus/Consensus.scala

@@ -2,7 +2,8 @@ package io.iohk.ethereum.consensus
 
 import io.iohk.ethereum.consensus.blocks.{BlockGenerator, TestBlockGenerator}
 import io.iohk.ethereum.consensus.difficulty.DifficultyCalculator
-import io.iohk.ethereum.consensus.pow.{MinerProtocol, MinerResponse}
+import io.iohk.ethereum.consensus.pow.miners.MinerProtocol
+import io.iohk.ethereum.consensus.pow.miners.MockedMiner.{MockedMinerProtocol, MockedMinerResponse}
 import io.iohk.ethereum.consensus.validators.Validators
 import io.iohk.ethereum.ledger.BlockPreparator
 import io.iohk.ethereum.ledger.Ledger.VMImpl
@@ -63,7 +64,7 @@ trait Consensus {
   /**
     * Sends msg to the internal miner and waits for the response
     */
-  def askMiner(msg: MinerProtocol): Task[MinerResponse]
+  def askMiner(msg: MockedMinerProtocol): Task[MockedMinerResponse]
 
   /**
     * Sends msg to the internal miner

src/main/scala/io/iohk/ethereum/consensus/pow/EthashMiner.scala

@@ -13,7 +13,7 @@ import io.iohk.ethereum.transactions.TransactionPicker
 import monix.eval.Task
 import scala.concurrent.duration.FiniteDuration
 
-class EthashBlockCreator(
+class PoWBlockCreator(
     val pendingTransactionsManager: ActorRef,
     val getTransactionFromPoolTimeout: FiniteDuration,
     consensus: PoWConsensus,