Improve discoverability of duality packages with csproj based packagemanagement

[Barsonax]

Summary

Now we are using the default .net tooling to do our package management we are missing the filters on tags so its harder to just show only duality packages.

Some possible ways to improve the discoverability of packages:

• Custom nuget feed containing only duality packages? More stuff to maintain though but also more control.
• Is actually mostly a issue with the nuget package manager UI in visual studio and the nuget site. The nuget api itself does support filtering on tags.