Query Params - difference between API GW and ALB

[JCapriotti]

I noticed if I go to a URL with a query string like this: ?x=foo%3Dbar

The event sent to a lambda from ALB contains:

"queryStringParameters":  {
    "x": "foo%3Dbar"
}

And the event sent from API Gateway contains:

"queryStringParameters":  {
    "x": "foo=bar"
}

For the ALB, the QUERY_STRING in the WSGI environment is set to:

x=foo%253Dbar

And for API Gateway, it is set to:

x=foo%3Dbar

So I think the processing of query params for ALB needs to not urlencode the data.

I am working on a PR for this and will hopefully submit later today.