Added CloudWatch client (#1045)

* Added CloudWatch client

* Re-generated code

* Added tests and some docs

Co-authored-by: Nyholm <tobias.nyholm@gmail.com>

Author: GrahamCampbell

src/DependencyInjection/AwsPackagesProvider.php

@@ -17,6 +17,10 @@ public static function getAllServices(): array
                 'class' => \AsyncAws\CloudFront\CloudFrontClient::class,
                 'package' => 'async-aws/cloud-front',
             ],
+            'cloud_watch' => [
+                'class' => \AsyncAws\CloudWatch\CloudWatchClient::class,
+                'package' => 'async-aws/cloud-watch',
+            ],
             'cloud_watch_logs' => [
                 'class' => \AsyncAws\CloudWatchLogs\CloudWatchLogsClient::class,
                 'package' => 'async-aws/cloud-watch-logs',