[misc] Add hatch, ruff, pre-commit and improve dev docs (#7409)

Authored by: bashonly, seproDev, Grub4K

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>
Co-authored-by: sepro <4618135+seproDev@users.noreply.github.com>

yt_dlp/extractor/common.py

@@ -1,5 +1,6 @@
 import base64
 import collections
+import functools
 import getpass
 import hashlib
 import http.client
@@ -21,7 +22,6 @@ import urllib.parse
 import urllib.request
 import xml.etree.ElementTree
 
-from ..compat import functools  # isort: split
 from ..compat import (
     compat_etree_fromstring,
     compat_expanduser,