Add optional dependencies (extras) for kde and gnome

[n8henrie]

It would be reasonable to expose extras for gnome and kde.

• gnome should depend on pygobject3, which provides gi.repository:

  pycookiecheat/src/pycookiecheat/chrome.py

  Line 197 in fe0d689

  import gi

• kwallet should depend on dbus-python: https://github.com/n8henrie/pycookiecheat/tree/fe0d6896eda7a5687460843102625fe2e3b6d485?tab=readme-ov-file#how-can-i-use-pycookiecheat-on-kde-based-linux-distros

Discussion at NixOS/nixpkgs#459709 (comment)