[wpinet] Move network portions of wpiutil into new wpinet library (#4077)

wpinet/src/main/native/cpp/uv/NetworkStream.cpp

@@ -0,0 +1,30 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "wpinet/uv/NetworkStream.h"
+
+namespace wpi::uv {
+
+ConnectReq::ConnectReq() {
+  error = [this](Error err) { GetStream().error(err); };
+}
+
+void NetworkStream::Listen(int backlog) {
+  Invoke(&uv_listen, GetRawStream(), backlog,
+         [](uv_stream_t* handle, int status) {
+           auto& h = *static_cast<NetworkStream*>(handle->data);
+           if (status < 0) {
+             h.ReportError(status);
+           } else {
+             h.connection();
+           }
+         });
+}
+
+void NetworkStream::Listen(std::function<void()> callback, int backlog) {
+  connection.connect(std::move(callback));
+  Listen(backlog);
+}
+
+}  // namespace wpi::uv