Temporarily bring JDT LS semantic tokens into Boot LS to avoid conflicts

headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/Collector.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016-2017 Pivotal, Inc.
+ * Copyright (c) 2016, 2024 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -37,4 +37,8 @@ public class Collector<T> implements IRequestor<T> {
 	public List<T> get() {
 		return nodes;
 	}
+	
+	public boolean isEmpty() {
+		return nodes.isEmpty();
+	}
 }