[FEATURE] Allow setting Chopper request options

[hai-trung-le]

(This is an extension of #642)

Is your feature request related to a problem? Please describe.
Chopper allows customizing some aspects of generated request handler, e.g., for GET request, the default syntax for nested query string is ?foo.bar.id=3, but we can change it to ?foo[bar][id]=3 by setting the argument listFormat:

@GET(path: '/api/user', listFormat: ListFormat.brackets)

However, there is no way to change those arguments in the *.swagger.dart file, other than manual editing, which is a cumbersome 3-step process (delete *.swagger.chopper.dart, edit *.swagger.dart, run build_runner)

Describe the solution you'd like
Options to set custom values for Chopper request handlers.

Swagger specification link
N/A

[Pistacchione]

Hello,

We had the same requirement and worked around the limitation in this way.

We created an extension for the Request object, adding the path that requires brackets.

extension RequestExt on Request {
  bool get requiredBracketsOnArrayQueryParams => uri.path.contains('/api/something');  
}

And then we created an interceptor:

class AddingBracketsToQueryParamsInteceptor implements Interceptor {
  @override
  FutureOr<Response<BodyType>> intercept<BodyType>(Chain<BodyType> chain) {
    if (chain.request.requiredBracketsOnArrayQueryParams) {
      return chain.proceed(
        chain.request.copyWith(listFormat: ListFormat.brackets),
      );
    }

    return chain.proceed(chain.request);
  }
}

It might not be the best solution globally, but at least it mitigates the issue of having to manually modify the generated files.