Add OAuth API Client

[rjra2611]

• Implements auth0 api client and helper method required to get auth information

Possible configuration we can add:

class AuthConfiguration(Configuration):

    def __init__(self, config_json_object):
        super().__init__(config_json_object)
        self._is_required_from_user = False

    def factory(config_json_object) -> 'AuthConfiguration':
        return AuthConfiguration(config_json_object)

[Martin-Molinero]

Thank you, included by https://github.com/QuantConnect/lean-cli/pull/469