Add IAM client (#595)

* Add IAM Client

* Add CRUD user operaionts

* Fix Endpoint returntype and CS

* Add IAM documentation

* Handle global endpoint

* Fix eventBridge url

* Add entry in Readme and AwsPackageProvider

* Remove phpstan-baseline.neon

Author: jderusse

src/DependencyInjection/AwsPackagesProvider.php

@@ -33,6 +33,10 @@ public static function getAllServices(): array
                 'class' => \AsyncAws\EventBridge\EventBridgeClient::class,
                 'package' => 'async-aws/event-bridge',
             ],
+            'iam' => [
+                'class' => \AsyncAws\Iam\IamClient::class,
+                'package' => 'async-aws/iam',
+            ],
             'lambda' => [
                 'class' => \AsyncAws\Lambda\LambdaClient::class,
                 'package' => 'async-aws/lambda',