Add a Type\TypeInterface that each of the ramsey/uuid types implements

src/Type/NumberInterface.php

@@ -19,9 +19,6 @@ namespace Ramsey\Uuid\Type;
  *
  * @psalm-immutable
  */
-interface NumberInterface
+interface NumberInterface extends TypeInterface
 {
-    public function toString(): string;
-
-    public function __toString(): string;
 }