Rework url structure to accommodate graphql and new quizzes endpoints

[Thetwam]

I wonder if instead of defining the_urlon all these calls we could modify requester.py to handle both of these patterns? Would eliminate a little redundancy. Would probably need like

self.base_url = base_url + "/api/v1"
self.new_quizzes_url = base_url + "/api/quiz/v1"

And then in requester.request would have to have some way of determining if it's a new quiz. >I feel like there will be more methods so having this a a little cleaner now could be of >benefit.

I'm not sure the best way to handle that though. The easy solution might be to re-use url? >Just an idea, not sure if it makes it significantly better.

       :param _url: Optional argument to specify the base URL to use for the request.
           If set to "new_quizzes", the `new_quizzes_url` instance variable will be used.
           If set to any other value (including None), the `base_url` instance variable will >be used.
           If this is selected and an endpoint is provided, the endpoint will be ignored
           and only the `_url` argument will be used.

       if _url == "new_quizzes":
           base_url = self.new_quizzes_url
       else:
           base_url = self.base_url

Originally posted by @jonespm in #612 (comment)