* Create SageMaker EndpointConfig with CloudFormation
Implement attributes for SM Endpoint Configs with CloudFormation
Delete SM Endpoint Configs with CloudFormation
Update SM Endpoint Configs with CloudFormation
* Fix typos in SM CF Model update test and refactor helper function for CF stack outputs
* Fixup weird commas in SM CF Test Configs from using black
* Create SageMaker Endpoints with CloudFormation
* Fix typos in SM CF update tests
* Create a formal interface for SM Cloudformation test configurations
* Create SageMaker Models with CloudFormation
* Utilize six for adding metaclass to TestConfig
* Update SM backend to return Model objects instead of response objects
