Prevent DefaultContext from being unregistered from key event handlers

api/src/main/java/com/bartlomiejpluta/base/api/input/KeyEventHandler.java

@@ -3,4 +3,12 @@ package com.bartlomiejpluta.base.api.input;
 @FunctionalInterface
 public interface KeyEventHandler {
    void handleKeyEvent(KeyEvent event);
+
+   default void onKeyEventHandlerRegister() {
+      // do nothing
+   }
+
+   default void onKeyEventHandlerUnregister() {
+      // do nothing
+   }
 }