[C#] Stream file uploads instead of copy all bytes into memory

ApiClient::ParameterToFile will copy complete file into ram before upload to rest service.

what about streaming a file to avoid OutOfMemory Exceptions on large files like:

public FileParameter ParameterToFile(string name, Stream stream)
        {
            var fp = new FileParameter
            {
                Writer = s =>
                {
                    using (StreamReader file = new StreamReader(stream))
                    {
                        file.BaseStream.CopyTo(s);
                    }
                },
                Name = name
            };


            if (stream is FileStream)
                fp.FileName = Path.GetFileName(((FileStream) stream).Name);
            else
                fp.FileName = "no_file_name_provided";
            return fp;
        }

current implementation:
ApiClient.mustache

if (stream is FileStream)
                return FileParameter.Create(name, ReadAsBytes(stream), Path.GetFileName(((FileStream)stream).Name));
            else
                return FileParameter.Create(name, ReadAsBytes(stream), "no_file_name_provided");

Start in modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache at ParameterToFile and compare its ReadAsBytes calls with the requested Stream-based approach. Trace how FileParameter is consumed during uploads, then verify that large streams are passed through without loading the complete file into memory while preserving the filename behavior shown in the issue.