Implement Raiden API endpoint

In case if Raiden API add new endpoint client should implement following steps:

Create new endpoint interface

1. Create new plugin file at raiden_client/plugins/

2. Implement BaseEndpoint interface

class Address(BaseEndpoint):
    """Querying Information About Your Raiden Node"""
    # TODO: Describe each method/parameter
    our_address = None

    @property
    def name(self) -> str:
        return "address"

    @property
    def endpoint(self) -> str:
        return "/address"

    @property
    def method(self) -> str:
        return "get"

    def payload(self) -> Dict[str, Any]:
        return {}

    def from_dict(self, response: Dict[str, Any]) -> None:
        self.our_address = response["our_address"]

    def to_dict(self) -> Dict[str, str]:
        return {"our_address": self.our_address}

3. Add new method at Client interface: raiden_client/interfaces/client.py

def address(self) -> Dict[str, str]:
    """Query your address."""
    endpoint = Address()
    return self.raiden_api.request(endpoint)

4. Create new command at raiden_client/interfaces/cli_commands/

def configure_parser(arg_parser: ArgumentParser, subparser: _SubParsersAction) -> None:
    address = subparser.add_parser("address", help="Query node address")
    address.set_defaults(func=parser_function)


def parser_function(args: Namespace) -> Dict[str, str]:
    c = Client()
    return c.address()

5. Write corresponding test to be sure that interface interact in expected way (regarding raiden api docs)