Integrate Package Manager (i.e., uv)

[wesstone12]

While most Python in Excel users might not care about managing packages, it’d be awesome to have the option. Curious how feasible it’d be to get uv working in Python in Excel—I'm sure there's a lot of complexity here that I’m not aware of. Maybe a simple GUI for a pyproject.toml to make it super user-friendly. uv is new, but it’d be really exciting to see this kind of functionality down the line!