feat: added basic event code

Author: quintesse

src/main/java/org/codejive/context/events/Event.java

@@ -0,0 +1,5 @@
+package org.codejive.context.events;
+
+public interface Event {
+    EventTarget target();
+}

src/main/java/org/codejive/context/events/EventEmitter.java

@@ -0,0 +1,22 @@
+package org.codejive.context.events;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class EventEmitter<T extends Event> {
+    private final List<EventListener<T>> listeners = new ArrayList<>();
+
+    public void addListener(EventListener<T> listener) {
+        listeners.add(listener);
+    }
+
+    public void removeListener(EventListener<T> listener) {
+        listeners.remove(listener);
+    }
+
+    public void dispatch(T event) {
+        for (EventListener<T> listener : listeners) {
+            listener.handleEvent(event);
+        }
+    }
+}

src/main/java/org/codejive/context/events/EventListener.java

@@ -0,0 +1,5 @@
+package org.codejive.context.events;
+
+public interface EventListener<T extends Event> {
+    void handleEvent(T event);
+}

src/main/java/org/codejive/context/events/EventTarget.java

@@ -0,0 +1,3 @@
+package org.codejive.context.events;
+
+public interface EventTarget {}