Added 'Sleep' operation.

src/core/operations/DateTime.js

@@ -189,6 +189,20 @@ const DateTime = {
     },
 
 
+    /**
+     * Sleep operation.
+     *
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {ArrayBuffer}
+     */
+    runSleep: async function(input, args) {
+        const ms = args[0];
+        await new Promise(r => setTimeout(r, ms));
+        return input;
+    },
+
+
     /**
      * @constant
      */