fix: apig vtl stringify

[thantos]

Do things that don't scale?

new AwsMethod(
  {
    httpMethod: "POST",
    resource: saga,
  },
  (
    $input: ApiGatewayInput<
      ApiRequest<
        {},
        Reservation & { [index: string]: ApiBody },
        { run_type?: RunType }
      >
    >
  ) => {
    return sagaFunction.func({
      input: {
        reservation: $input.data!,
        run_type: $input.params("run_type")!,
      },
    });
  },
  (result) => {
    return result.data;
  }
);

{
"stateMachineArn":"arn:aws:states:us-east-1:180727192481:stateMachine:sagasagaFunction54D97EEF-B6WfpKLDY3QV",
"input":"{\"reservation\":$util.escapeJavaScript($input.json('$')),\"run_type\":\"$input.params('run_type')\"}"
}

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[sam-goodwin]

Does it fail sometimes?

[thantos]

No idea. Don't have exhaustive tests or runtime tests, but it works for the two cases I tried. I assume it will need to get more complex as more cases are found or we re-architect to support the various output cases (ex: late resolution with a sub-ast instead of in place transform that can account for the need to be a string instead of an object.)