Add unshift method to Collection (#51344)

Collection.php

@@ -995,6 +995,19 @@ public function push(...$values)
         return $this;
     }
 
+    /**
+     * Prepend one or more items to the beginning of the collection.
+     *
+     * @param  TValue  ...$values
+     * @return $this
+     */
+    public function unshift(...$values)
+    {
+        array_unshift($this->items, ...$values);
+
+        return $this;
+    }
+
     /**
      * Push all of the given items onto the collection.
      *