add PEP 723 script detection and activation

[Weidav]

Added PEP 723 support as requested in #10
Checks for PEP 723 compatible scripts and, searches for the venv path by running uv python find --script an activates tit.

[teticio]

Hi

First of all, thanks for picking this up and doing the work. I've been recovering from a motorcycle accident for a while, so I didn't get around to looking into it.

I have to say, I'm not completely convinced it makes sense to do this. It feels like it is a bit at odds with the purpose of the extension. I can only think of a use case where you have a script depending on a venv that is managed outside of the project that you want to debug for some reason, so you click on it and run "Debug Python File" and it loads the correct venv. Can you help me understand the use cases better?

I will leave this open for the time being. If anyone else coming here thinks this is useful, please let me know and ideally help me to understand how.

Thanks