Refactor corellium client to functional style

Add some diagrams

corellium/client/src/main/kotlin/flank/corellium/client/agent/Agent.kt

@@ -0,0 +1,16 @@
+package flank.corellium.client.agent
+
+import flank.corellium.client.data.CommandResult
+import io.ktor.client.features.websocket.ClientWebSocketSession
+import kotlinx.serialization.json.Json
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.atomic.AtomicInteger
+
+class Agent internal constructor(
+    internal val session: ClientWebSocketSession,
+    internal val tasks: TasksMap = TasksMap(),
+    internal val counter: AtomicInteger = AtomicInteger(1),
+    internal val format: Json = Json {},
+)
+
+typealias TasksMap = ConcurrentHashMap<Int, (CommandResult) -> Unit>