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/TimeGeneratorInterface.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of the ramsey/uuid library
  *
@@ -7,37 +8,28 @@
  *
  * @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 Exception;
-use InvalidArgumentException;
-use Ramsey\Uuid\Exception\UnsatisfiedDependencyException;
-
 /**
- * TimeGeneratorInterface provides functionality to generate strings of binary
- * data for version 1 UUIDs based on a host ID, sequence number, and the current
- * time
+ * A time generator generates strings of binary data based on a node ID,
+ * clock sequence, and the current time
  */
 interface TimeGeneratorInterface
 {
     /**
-     * Generate a version 1 UUID from a host ID, sequence number, and the current time
+     * Generate a binary string from a node ID, clock sequence, and current time
      *
-     * @param int|string $node A 48-bit number representing the hardware address
-     *     This number may be represented as an integer or a hexadecimal string.
+     * @param int|string $node A 48-bit number representing the hardware address;
+     *     this number may be represented as an integer or a hexadecimal string
      * @param int $clockSeq A 14-bit number used to help avoid duplicates that
      *     could arise when the clock is set backwards in time or if the node ID
-     *     changes.
+     *     changes
+     *
      * @return string A binary string
-     * @throws UnsatisfiedDependencyException if called on a 32-bit system and
-     *     `Moontoast\Math\BigNumber` is not present
-     * @throws InvalidArgumentException
-     * @throws Exception if it was not possible to gather sufficient entropy
      */
-    public function generate($node = null, int $clockSeq = null): string;
+    public function generate($node = null, ?int $clockSeq = null): string;
 }