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/TimeGeneratorFactory.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of the ramsey/uuid library
  *
@@ -7,11 +8,10 @@
  *
  * @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;
 
 use Ramsey\Uuid\Converter\TimeConverterInterface;
@@ -19,7 +19,8 @@ use Ramsey\Uuid\Provider\NodeProviderInterface;
 use Ramsey\Uuid\Provider\TimeProviderInterface;
 
 /**
- * A factory for retrieving a time generator, based on the environment
+ * TimeGeneratorFactory retrieves a default time generator, based on the
+ * environment
  */
 class TimeGeneratorFactory
 {
@@ -38,14 +39,6 @@ class TimeGeneratorFactory
      */
     private $timeProvider;
 
-    /**
-     * Constructs a `TimeGeneratorFactory` using a node provider, time converter,
-     * and time provider
-     *
-     * @param NodeProviderInterface $nodeProvider
-     * @param TimeConverterInterface $timeConverter
-     * @param TimeProviderInterface $timeProvider
-     */
     public function __construct(
         NodeProviderInterface $nodeProvider,
         TimeConverterInterface $timeConverter,
@@ -58,8 +51,6 @@ class TimeGeneratorFactory
 
     /**
      * Returns a default time generator, based on the current environment
-     *
-     * @return TimeGeneratorInterface
      */
     public function getGenerator(): TimeGeneratorInterface
     {