[Distribution] Add support for C#/VB/F# (.NET Toolchain)

[carstencodes]

When building .NET protobuf serializers, gRPC services or grpc clients, the proto files are actually generated during the build using the Protobuf collection.

This project is already shipping a maven package. It should be possible to ship a nuget package as well.

Steps to take:

• [ ] Add packaging information for a nuget package
• [ ] Add automatic targets for automatically running as a development tool
• [ ] Pack NuGet package after go-releaser has run
• [ ] Upload NuGet package to nuget.org

I could help with the first three bullet points. I think the last point is up to the maintainer.

[carstencodes]

In addition to that, #336 should be solved.

[yoheimuta]

@carstencodes Thank you for the distribution proposals (#337, #338, #339)! If someone actually wishes to install the binary using these distributions, I have no objections to supporting them. Your contribution is greatly appreciated.