Store commands as nodes and execute them

src/main/java/net/minecraft/commands/tree/LiteralCommandNode.java

@@ -2,12 +2,18 @@ package net.minecraft.commands.tree;
 
 public class LiteralCommandNode extends CommandNode {
     private final String literal;
+    private final Runnable executor;
 
-    public LiteralCommandNode(String literal) {
+    public LiteralCommandNode(String literal, Runnable executor) {
         this.literal = literal;
+        this.executor = executor;
     }
 
     public String getLiteral() {
         return literal;
     }
+
+    public Runnable getExecutor() {
+        return executor;
+    }
 }