Update coding style to include PSR-12, among other options

This also includes heavy use of slevomat/coding-standard to apply
various checks to the code, based on maintainer (me) preference.

src/Generator/PeclUuidRandomGenerator.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of the ramsey/uuid library
  *
@@ -7,27 +8,19 @@
  *
  * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
  * @license http://opensource.org/licenses/MIT MIT
- * @link https://benramsey.com/projects/ramsey-uuid/ Documentation
- * @link https://packagist.org/packages/ramsey/uuid Packagist
- * @link https://github.com/ramsey/uuid GitHub
  */
 
+declare(strict_types=1);
+
 namespace Ramsey\Uuid\Generator;
 
 /**
- * PeclUuidRandomGenerator provides functionality to generate strings of random
- * binary data using the PECL UUID PHP extension
+ * PeclUuidRandomGenerator generates strings of random binary data using ext-uuid
  *
- * @link https://pecl.php.net/package/uuid
+ * @link https://pecl.php.net/package/uuid ext-uuid
  */
 class PeclUuidRandomGenerator implements RandomGeneratorInterface
 {
-    /**
-     * Generates a string of random binary data of the specified length
-     *
-     * @param int $length The number of bytes of random binary data to generate
-     * @return string A binary string
-     */
     public function generate(int $length): string
     {
         $uuid = uuid_create(UUID_TYPE_RANDOM);