Extract factory interface & add basic pecl impl

src/UuidFactoryInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Rhumsaa\Uuid;
+
+interface UuidFactoryInterface
+{
+    public function uuid1($node = null, $clockSeq = null);
+
+    public function uuid3($ns, $name);
+
+    public function uuid4();
+
+    public function uuid5($ns, $name);
+
+    public function fromBytes($bytes);
+
+    public function fromString($name);
+
+    public function fromInteger($integer);
+
+}