Add uv flag to python module

[nazq]

Feature Request

uv is a great rust built pip replacement (https://github.com/astral-sh/uv). Would be great to add a variable to show if the env was created by uv

Is your feature request related to a problem? Please describe.

I have many different projects, some which are pip managed venvs, some which are uv managed. Would be great to see the difference

Describe the solution you'd like

I'd want to see an icon if this is a uv venv, Here's the one from the repo https://avatars.githubusercontent.com/u/115962839?s=48&v=4

Describe alternatives you've considered

[[ -z "$VIRTUAL_ENV" ]] && echo "unk" || grep -q '^uv =' "$VIRTUAL_ENV/pyvenv.cfg" && echo "uv" || echo "pip"