Authenticode sign assemblies

**What language and solver does this apply to?**
.NET

**Describe the problem you are trying to solve.**
We want to use Google.OrTools but there are company policies that require third-party code to be authenticode signed.

**Describe the solution you'd like**
Authenticode sign the assemblies inside Google.Ortools.

**Additional context**
Protobuf already has authenticode signing support, we can get implementation information from them https://github.com/protocolbuffers/protobuf/issues/5756 and https://github.com/grpc/grpc-dotnet/issues/24.