Add isort pre-commit hook

Sort import statement in python files

See https://github.com/PyCQA/isort

python_apps/airtime_analyzer/setup.py

@@ -1,6 +1,7 @@
-from setuptools import setup
 import os
 
+from setuptools import setup
+
 # Change directory since setuptools uses relative paths
 os.chdir(os.path.dirname(os.path.realpath(__file__)))