Add snupkg support
Notably for windows libvlc builds, this would be quite useful.
Package consumers can use the symbols published to nuget.org symbol server by adding https://symbols.nuget.org/download/symbols to their symbol sources in Visual Studio, which allows stepping into package code in the Visual Studio debugger.
https://docs.microsoft.com/en-us/nuget/create-packages/symbol-packages-snupkg