feat: register multiple commands (#2394)

src/main/java/net/minestom/server/command/CommandManager.java

@@ -60,6 +60,18 @@ public final class CommandManager {
         invalidateGraphCache();
     }
 
+    /**
+     * Register multiple {@link Command}s.
+     *
+     * @param commands the array of commands
+     * @throws IllegalStateException if a command with the same name already exists
+     */
+    public synchronized void register(@NotNull Command... commands) {
+        for (Command command : commands) {
+            register(command);
+        }
+    }
+
     /**
      * Removes a command from the currently registered commands.
      * Does nothing if the command was not registered before