Lambda annotations: able to use your own JsonSerializerOptions when parsing request and generating response

### Describe the feature

A way to control what serializing options to use when parsing a request or generating a response using `HttpResults`

### Use Case

1. When parsing a request as of now and you're expecting for example camelCase. You would have to decorate your model props with `JsonPropertyName` that follows camelCase for it to be able to parse. Same when generating a response using `HttpResults` and you want it to return camelCase.

### Proposed Solution

It would be nice to be able to set it in `Startup` for all lambdas. For `HttpResults` it would be enough to be able to inject it in somehow.

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS .NET SDK and/or Package version used

Amazon.Lambda.Annotations 0.12.0

### Targeted .NET Platform

.NET 6

### Operating System and version

Windows 10