Create requests-async based TestClient, remove aiohttp dependency, drop Python 3.5

Update all tests to be compatible with requests-async
Cleanup testing client changes with black and isort
Remove Python 3.5 and other meta doc cleanup
rename pyproject and fix pep517 error
Add black config to tox.ini
Cleanup tests and remove aiohttp
tox.ini change for easier development commands
Remove aiohttp from changelog and requirements
Cleanup imports and Makefile

tests/test_logging.py

@@ -1,17 +1,17 @@
-import uuid
 import logging
+import uuid
 
-from io import StringIO
 from importlib import reload
-
-import pytest
+from io import StringIO
 from unittest.mock import Mock
 
+import pytest
+
 import sanic
-from sanic.response import text
-from sanic.log import LOGGING_CONFIG_DEFAULTS
+
 from sanic import Sanic
-from sanic.log import logger
+from sanic.log import LOGGING_CONFIG_DEFAULTS, logger
+from sanic.response import text
 
 
 logging_format = """module: %(module)s; \