Fix some missing type information

This is a first stab at completing type information for pyTwitchAPI to make mypy shut up when I'm using pyTwitchAPI. As this is my first contribution, I'm limiting this to low hanging fruit and a few of the files. If all goes well I'll do more.

Signed-off-by: Cmdr. Emily <68452184+cmdremily@users.noreply.github.com>

Author: cmdremily

setup.py

@@ -1,4 +1,5 @@
 #  Copyright (c) 2022. Lena "Teekeks" During <info@teawork.de>
+from platform import python_version
 from setuptools import setup, find_packages
 
 version = ''
@@ -25,6 +26,7 @@
 setup(
     packages=find_packages(),
     version=version,
+    python_version="3.7",
     keywords=['twitch', 'twitch.tv', 'chat', 'bot', 'event sub', 'EventSub', 'helix', 'api'],
     install_requires=[
         'aiohttp>=3.9.3',