Add back Producer, should fix potential addon incompatibilities

Author: Wide-Cat

src/main/java/meteordevelopment/meteorclient/utils/misc/Producer.java

@@ -0,0 +1,10 @@
+/*
+ * This file is part of the Meteor Client distribution (https://github.com/MeteorDevelopment/meteor-client).
+ * Copyright (c) Meteor Development.
+ */
+
+package meteordevelopment.meteorclient.utils.misc;
+
+public interface Producer<T> {
+    T create();
+}