refactor: Improve type hints and formatting (#133)

* Use isort and black to format

* Fix most mypy errors

* Fix all typing error with strict mypy

* Replace *args, **kwargs by explicit parameters

* Use ssl._PasswordType instead of str

* Fix typing

- Add *args, **kwargs to subscribe, unsubscribe and publish
- Remove forward reference
- Remove private ssl types
- Revert _pending_subscribes to asyncio.Future
- Use Union instead of |
- Use List and Tuple instead of list and tuple
-  Other minor changes

* Fix tls_version type

* Change Awaitable with Coroutine for _outgoing_call

.gitignore

@@ -3,5 +3,5 @@ build
 dist
 *.egg-info
 local_test.py
-
+.venv
 .idea/

asyncio_mqtt/__init__.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
-from .error import MqttError, MqttCodeError
-from .client import Client, Will, ProtocolVersion, TLSParameters
+from .client import Client, ProtocolVersion, TLSParameters, Will
+from .error import MqttCodeError, MqttError
 from .version import __version__
 
 __all__ = [