Make NuGet packages installable with "dotnet tool"

[zooba]

Feature or enhancement

Reference (not how we'll do it, but a starting point): https://learn.microsoft.com/en-us/dotnet/core/tools/global-tools-how-to-create

We ought to be able to make dotnet tool install python work with some metadata in our NuGet package. We should do this, because it'd be awesome.

[zooba]

Turns out we could only do this with a .NET assembly (it only supports .DLLs), and while it would be possible to add one that launches our EXE, it's probably not really worth it.

If PEP-773 gets rejected then I'll probably revisit this, but I'd rather just fix our own stuff before investing heavily in other ecosystems.

[picnixz]

What's the status of this one @zooba ?

[zooba]

I'm not going to bother. Nuget is just too limited here for us - app store/MSIX is better.