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/Converter/TimeConverterInterface.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of the ramsey/uuid library
  *
@@ -7,19 +8,15 @@
  *
  * @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\Converter;
 
-use InvalidArgumentException;
-use Ramsey\Uuid\Exception\UnsatisfiedDependencyException;
-
 /**
- * TimeConverterInterface provides facilities for converting parts of time into
- * representations that may be used in UUIDs
+ * A time converter converts timestamps into representations that may be used
+ * in UUIDs
  */
 interface TimeConverterInterface
 {
@@ -27,24 +24,25 @@ interface TimeConverterInterface
      * Uses the provided seconds and micro-seconds to calculate the time_low,
      * time_mid, and time_high fields used by RFC 4122 version 1 UUIDs
      *
-     * @param string $seconds
-     * @param string $microSeconds
+     * @link http://tools.ietf.org/html/rfc4122#section-4.2.2 RFC 4122, § 4.2.2: Generation Details
+     *
+     * @param string $seconds A string representation of the number of seconds
+     *     since the Unix epoch for the time to calculate
+     * @param string $microSeconds A string representation of the micro-seconds
+     *     associated with the time to calculate
+     *
      * @return string[] An array guaranteed to contain `low`, `mid`, and `hi` keys
-     * @throws InvalidArgumentException if $seconds or $microseconds are not integer strings
-     * @throws UnsatisfiedDependencyException if the chosen converter is not present
-     * @link http://tools.ietf.org/html/rfc4122#section-4.2.2
      */
     public function calculateTime(string $seconds, string $microSeconds): array;
 
     /**
-     * Converts a timestamp extracted from a UUID to a unix timestamp
+     * Converts a timestamp extracted from a UUID to a Unix timestamp
      *
      * @param string $timestamp A string integer representation of a timestamp;
      *     this must be a numeric string to accommodate unsigned integers
      *     greater than PHP_INT_MAX.
-     * @return string
-     * @throws InvalidArgumentException if $timestamp is not an integer string
-     * @throws UnsatisfiedDependencyException if the chosen converter is not present
+     *
+     * @return string String representation of an integer
      */
     public function convertTime(string $timestamp): string;
 }