Support `uv run` as an optional default run action.

@anthonykim1 ci sta già lavorando.

Dal 13/3/2026.

Currently, the Run Python File in Terminal play button (and the default python debugger) is hardcoded to run the current python file using the activated environment.

For [uv scripts with dependencies](https://docs.astral.sh/uv/guides/scripts/#declaring-script-dependencies) this causes an issue.

If it were possible to configure this as a setting to run using `uv run ${file}` instead, it would allow seamless integration for rust scripts, same for the debugger.

I've come from related issues: https://github.com/astral-sh/uv/issues/8558, https://github.com/astral-sh/uv/issues/7803, and https://github.com/astral-sh/ty-vscode/issues/353, but realised it's not possible to implement this feature anywhere other than the vscode-python repo.

Debugging can work with a custom launch.json specifying `uv run --with-requirments ${file} python`, but this has the caveat that it will fail for scripts with no inline dependencies defined. Being able to use just `uv run` as the actual command would allow it to always work. Though my guess is this requires work on debugpy itself to better support uv.