feat: refresh JWT whenever needed

[betodealmeida]

A customer needs to run a really big import (~12 hours), but the JWT is only valid for 5. So I added some logic to refresh authentication (across all mechanisms) whenever needed.

The main auth class (simplified) now looks like this:

class Auth:  # pylint: disable=too-few-public-methods
    def __init__(self):
        self.session = Session()

        # call ``self.reauth`` after every request
        self.session.hooks["response"].append(self.reauth)

    def auth(self) -> None:
        raise NotImplementedError("Must be implemented for reauthorizing")

    def reauth(self, r: Response, *args: Any, **kwargs: Any) -> Response:
        if r.status_code != 401:
            return r

        # if the response was 401, auth and try again
        try:
            self.auth()
        except NotImplementedError:
            return r

        self.session.headers.update(self.get_headers())
        r.request.headers.update(self.get_headers())
        return self.session.send(r.request, verify=False)

On __init__ it attaches a hook to the session, calling reauth after every request. On reauth, if the response was a 401 and the derived class implements the auth method, then auth gets called to refresh cookies/tokens, and the request is resent.

This PR implements auth for the Preset and the username:password authentication mechanisms.

[betodealmeida]

I got rid of get_session, since it only added noise.