CatHunter17

Add trailers metadata support in unary response methods

2

## Summary This merge request introduces the capability for servers to send custom metadata (trailers) in responses for unaryToUnary and clientStreaming methods using the fs2.grpc library. Prior to this change,...

I've found that this piece of code prints "message" twice: ``` object Main extends App { object StringByString extends Data[String, String] { type StringByString[F[_]] = DataSource[F, String, String] def name:...