SecretsManager Client (#1036)

* [SecretsManager] Create service with tests

* [Core] Add factory for SecretsManager

* Make SecretsManager test work when running all tests

* [SecretsManager] Add docs

* [SecretsManager] Code style fix

* Update psalm baseline to include SecretsManager

Author: sunkan

src/DependencyInjection/AwsPackagesProvider.php

@@ -69,6 +69,10 @@ public static function getAllServices(): array
                 'class' => \AsyncAws\SimpleS3\SimpleS3Client::class,
                 'package' => 'async-aws/simple-s3',
             ],
+            'secrets_manager' => [
+                'class' => \AsyncAws\SecretsManager\SecretsManagerClient::class,
+                'package' => 'async-aws/secrets-manager',
+            ],
             'ses' => [
                 'class' => \AsyncAws\Ses\SesClient::class,
                 'package' => 'async-aws/ses',