allow qs options to be passed through

[Mattchewone]

Allows for adding additional options for the qs.stringify method. I came to this as it's currently not possible at least from my trial and error, to be able to override the rest client so that getQuery can be extended so I can provide my own qs with options.

const feathersClient = feathers()
  .configure(restClient.fetch(fetch, {
    qsStringifyOptions: {
      strictNullHandling: true
    }
  }));

[marshallswain]

Looks good to me.

[daffl]

Thank you for the pull request @Mattchewone. I think what we'd really want to do here instead of just adding another option is being able to add a custom client service class with a customized getQuery. The API I'm thinking would look like this:

const feathers = require('@feathersjs/feathers');
const rest = require('@feathersjs/rest-client');
const { FetchClientService } = ​rest;

const app = feathers();
​
class MyFetchClient extends FetchClientService {
  getQuery () {
    return {};
  }
}
​
// Connect to a different URL
const restClient = rest('http://feathers-api.com');
​
// Configure an AJAX library (see below) with that client 
app.configure(restClient.fetch(window.fetch, MyFetchClient));
​
// Connect to the `http://feathers-api.com/messages` service
const messages = app.service('messages');

Also related to #1102

[Mattchewone]

Closed due to newer version - #1780