Add NameGeneratorInterface and generators for v3 and v5 UUIDs

tests/Generator/NameGeneratorFactoryTest.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ramsey\Uuid\Test\Generator;
+
+use Ramsey\Uuid\Generator\DefaultNameGenerator;
+use Ramsey\Uuid\Generator\NameGeneratorFactory;
+use Ramsey\Uuid\Test\TestCase;
+
+class NameGeneratorFactoryTest extends TestCase
+{
+    public function testGetGenerator(): void
+    {
+        $factory = new NameGeneratorFactory();
+
+        $this->assertInstanceOf(DefaultNameGenerator::class, $factory->getGenerator());
+    }
+}