feat: Add sending of steps count

Author: Parzival-05

usvm-ml-gameserver/src/main/kotlin/org.usvm/gameserver/Explorer.kt

@@ -33,6 +33,7 @@ fun randomExplorer(
     return GameOver(
         floor(percentageCoverage).toUInt(),
         test = tests.toUInt(),
+        stepsCount = gameMap.stepsToStart + gameMap.stepsToStart, // TODO: send the actual step count
         error = errors.toUInt()
     )
 }

usvm-ml-gameserver/src/main/kotlin/org.usvm/gameserver/Messages.kt

@@ -63,6 +63,7 @@ sealed class OutputMessageBody
 data class GameOver(
     @SerialName("ActualCoverage") val percent: UInt,
     @SerialName("TestsCount") val test: UInt,
+    @SerialName("StepsCount") val stepsCount: UInt,
     @SerialName("ErrorsCount") val error: UInt
 ) : OutputMessageBody()