Add an example of streaming with API Gateway

[sebsto]

Describe the feature

Now that API Gateway supports streaming, add an example to show how to configure this with Swift Lambda functions

Launch blog
https://aws.amazon.com/blogs/compute/building-responsive-apis-with-amazon-api-gateway-response-streaming/

API Doc
https://docs.aws.amazon.com/apigateway/latest/developerguide/response-transfer-mode.html

Use Case

LLM generated content through API

Proposed Solution

Add an example, at this stage, I don't think code change is required in the library

Other Information

n/a

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change