Add Comprehend client (#1259)

* Add Comprehend client

* Added tests

* fixed broken tests

* Update baseline

* Updated docs

Author: Nyholm

src/AwsClientFactory.php

@@ -13,6 +13,7 @@
 use AsyncAws\CodeCommit\CodeCommitClient;
 use AsyncAws\CodeDeploy\CodeDeployClient;
 use AsyncAws\CognitoIdentityProvider\CognitoIdentityProviderClient;
+use AsyncAws\Comprehend\ComprehendClient;
 use AsyncAws\Core\Credentials\CacheProvider;
 use AsyncAws\Core\Credentials\ChainProvider;
 use AsyncAws\Core\Credentials\CredentialProvider;
@@ -200,6 +201,19 @@ public function codeDeploy(): CodeDeployClient
         return $this->serviceCache[__METHOD__];
     }
 
+    public function comprehend(): ComprehendClient
+    {
+        if (!class_exists(ComprehendClient::class)) {
+            throw MissingDependency::create('async-aws/comprehend', 'ComprehendClient');
+        }
+
+        if (!isset($this->serviceCache[__METHOD__])) {
+            $this->serviceCache[__METHOD__] = new ComprehendClient($this->configuration, $this->credentialProvider, $this->httpClient, $this->logger);
+        }
+
+        return $this->serviceCache[__METHOD__];
+    }
+
     public function dynamoDb(): DynamoDbClient
     {
         if (!class_exists(DynamoDbClient::class)) {