Generify endpoint groups as IntelliJ Modules

This allows them to be built sperately decreasing JAR size and also creates a better structure for generic service functions and business logic.

Lambdas/Lists/Item/src/ItemGetter.java

@@ -0,0 +1,9 @@
+import java.sql.SQLException;
+import java.util.Map;
+
+public class ItemGetter implements CallHandler{
+    @Override
+    public String conductAction(Map<String, Object> bodyMap, String cognitoID) throws SQLException {
+        return null;
+    }
+}