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.