add the mavlink_passthrough in grpc #2623
Description
The features I'm currently developing communicate with the GCS (Ground Control Station) using mavlink_v2_extension messages. Therefore, it would be great if mavsdk_server could process mavlink_v2_extension messages. I considered trying to implement and build this myself, but building it on Windows is not easy; I encounter many errors. It would be highly appreciated if this aspect could be considered in the next version. Simply being able to receive the payload part of the mavlink_v2_extension message as a byte array, similar to how log_stream currently handles data, would be sufficient.
And it would be greatly appreciated if, when releasing the Windows MAVSDK library, you could also provide the debug-mode built libraries alongside the release versions.