This is designed to prevent a server from being attacked with a client with a certificate issued by a trusted system CA.
Some commercial CA actually can issue certificate to individual to proof their identity. The server should not accept these certs as a valid client certificates.
* Update protoc binary executable files to v3.13.0
* Write proto files in more standard way
* Make go generate & vprotogen compatible with protoc-gen-gofast
* Regenerate pb.go files according to new proto files
* Clean go.sum by running go mod tidy
* Implement mustEmbedUnimplementedServiceServer for gPRC services