Improve debugging experience

[matherm-aboehm]

While it is an improvement to have NuGet packages with debug symbols in the release assets available for download, it would be even better to actually upload them to the official NuGet Symbol Servers by your build automation. So Visual Studio would pick them up automatically if debug configuration includes NuGet Symbol Servers.

It would be also nice to have Source Link data included in debug symbols, so you don't need to clone the whole repo beforehand for debugging, instead the debugger would download all source files on demand from GitHub. You could just implement the same like in sprache/Sprache#174 (PR: sprache/Sprache#177).

[nblumhardt]

Thanks for the note, @matherm-aboehm - we've updated builds of most of our libraries to do this, it seems we haven't made a new release here for a while so I'll add this one to the list 👍