Added codestyle check and lint to the build action (#798)

* Applied `make format`

* Added format-check to makefile

* Added a "Check codestyle" step to the build action.

* Rerun `make format`

* Added a "lint" target to makefile

* Added lint step to the build action

* Added W503 to the list of ignored flake8 errors.

See https://www.flake8rules.com/rules/W503.html

tests/test_router_register.py

@@ -105,9 +105,7 @@ class TestRegister:
 
 
 @pytest.mark.asyncio
-async def test_register_namespace(
-    get_user_manager
-):
+async def test_register_namespace(get_user_manager):
     app = FastAPI()
     app.include_router(
         get_register_router(