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/performance/sanic/http_response.py

@@ -1,16 +1,18 @@
-import asyncpg
-import sys
-import os
 import inspect
+import os
+import sys
+import timeit
+
+import asyncpg
+
+from sanic.response import json
+
 
 currentdir = os.path.dirname(
     os.path.abspath(inspect.getfile(inspect.currentframe()))
 )
 sys.path.insert(0, currentdir + "/../../../")
 
-import timeit
-
-from sanic.response import json
 
 print(json({"test": True}).output())
 

tests/performance/sanic/simple_server.py

@@ -1,14 +1,16 @@
-import sys
-import os
 import inspect
+import os
+import sys
+
+from sanic import Sanic
+from sanic.response import json
+
 
 currentdir = os.path.dirname(
     os.path.abspath(inspect.getfile(inspect.currentframe()))
 )
 sys.path.insert(0, currentdir + "/../../../")
 
-from sanic import Sanic
-from sanic.response import json
 
 app = Sanic("test")
 

tests/performance/sanic/varied_server.py

@@ -1,15 +1,17 @@
-import sys
-import os
 import inspect
+import os
+import sys
+
+from sanic import Sanic
+from sanic.exceptions import ServerError
+from sanic.response import json, text
+
 
 currentdir = os.path.dirname(
     os.path.abspath(inspect.getfile(inspect.currentframe()))
 )
 sys.path.insert(0, currentdir + "/../../../")
 
-from sanic import Sanic
-from sanic.response import json, text
-from sanic.exceptions import ServerError
 
 app = Sanic("test")
 
@@ -56,8 +58,6 @@ def query_string(request):
     )
 
 
-import sys
-
 app.run(host="0.0.0.0", port=sys.argv[1])