Add isort and ruff linter (#6575)

* Add isort and ruff linter

Both linters are pretty common among modern python code bases.

The isort tool provides stable sorting and grouping, as well as pruning
of unused imports.

Ruff is a modern linter, that is very fast due to being written in rust.
It can detect many common issues in a python codebase.

Removes the pylint dev requirement, since ruff replaces it.

* treewide: fix issues detected by ruff

* treewide: fix bare except clauses

* .devcontainer: Set up isort

* treewide: optimize imports

* treewide: apply black

* treewide: make regex patterns raw strings

This is necessary for escape sequences to be properly recognized.

frigate/events/external.py

@@ -1,17 +1,15 @@
 """Handle external events created by the user."""
 
 import base64
-import cv2
 import datetime
-import glob
 import logging
 import os
 import random
 import string
-
+from multiprocessing.queues import Queue
 from typing import Optional
 
-from multiprocessing.queues import Queue
+import cv2
 
 from frigate.config import CameraConfig, FrigateConfig
 from frigate.const import CLIPS_DIR