Sign the assemblies

The assemblies in this package are not signed, and do not have a strong name.
As a result, this package can not be used from signed code.
In enterprise environments, using signed code is seen as a best practice.

Please see the [dotnet documentation](https://learn.microsoft.com/en-us/dotnet/standard/assembly/sign-strong-name) on how to sign assemblies with a strong name.
