add option to virtualenv prompt for show eventually python version [Enhancement]

[jerome-diver]

Description

for prompt_virtualenv, i see other guys asked for see python version inside the virtual environment used with virtualenv.
It is possible by add an option (read the README.md file on this segment, i tryed to follow the way to pull request (firts time!).
Tell me if i do wrong.
Works perfectly on my system and oing to pull request also on powerlevel10k forked project.

[Syphdias]

Hey @jerome-diver,

thank you for your PR, unfortunately you have included pretty much every change from https://github.com/romkatv/powerlevel10k. This makes merging impossible.

The way you would usually open a PR is to:

1. Fork the project
2. Checkout the branch you want to open a pull request against
3. Create a new branch "fancy-new-feature"
4. Change stuff
5. Commit your changes to the new branch
6. Push your changes to your fork
7. Open a PR on GitHub

HTH
Syphdias

[Syphdias]

Closing in favour of #1234