feat: Implement enable_type_name config method

[mikhailzagurskiy]

Sometimes for infrastructure purposes we need to get name of the type to build topics or subjects in message queue, based on the type name. The prost_build::Config type has an ability to auto implement prost::Name trait for any type. To do so, the config has enable_type_name() method, but that method wasn't passed through prost_grpc_build::Config. I've added such method to the config and have added example to show the value

[attila-lin]

Thank you!