feat(client-sfn): Add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: awstools

codegen/sdk-codegen/aws-models/sfn.json

@@ -150,7 +150,7 @@
           "sdkId": "SFN",
           "arnNamespace": "states",
           "cloudFormationName": "StepFunctions",
-          "cloudTrailEventSource": "sfn.amazonaws.com",
+          "cloudTrailEventSource": "states.amazonaws.com",
           "docId": "states-2016-11-23",
           "endpointPrefix": "states"
         },
@@ -4222,7 +4222,20 @@
           "outputToken": "nextToken",
           "items": "activities",
           "pageSize": "maxResults"
-        }
+        },
+        "smithy.test#smokeTests": [
+          {
+            "id": "ListActivitiesSuccess",
+            "params": {},
+            "vendorParams": {
+              "region": "us-west-2"
+            },
+            "vendorParamsShape": "aws.test#AwsVendorParams",
+            "expect": {
+              "success": {}
+            }
+          }
+        ]
       }
     },
     "com.amazonaws.sfn#ListActivitiesInput": {