Is it possible to test LambdaFunctionURL lambdas with aws-lambda-rie ?

I have a 2 lambdas:
* One that take a `CloudWatchEvent` as the second argument of the `Handle()`function
* One that take a `LambdaFunctionURLRequest`as the second argument of the `Handle()`function

I'm able to successfully test with `aws-lambda-rie`the first Lambda but not the second one

Even with a quite naive handler:
```
func Handle(ctx context.Context, request events.LambdaFunctionURLRequest) error {
log.Printf("body: %s", request.RawPath)
return nil
}
```

Is it possible to test this "new" kind of lambdas using `aws-lambda-runtime` ? Am I doing something wrong ?

Start by reproducing the request with aws-lambda-rie using the Go Handle function and comparing the CloudWatchEvent and LambdaFunctionURLRequest cases. The issue names no repository files or tests; done means establishing whether LambdaFunctionURLRequest is supported and documenting or implementing the required behavior.

Written by the indexing model from the issue text.