message: Include configured mid and rid when logging AudioSendStream config
  No-try: True  # ios_sim_x64_dbg_ios14 seems highly flaky
  Cr-Commit-Position: refs/heads/master@{#32873}
diff: @@ -51,6 +51,12 @@ std::string AudioSendStream::Config::Rtp::ToString() const {
  char buf[1024];
  rtc::SimpleStringBuilder ss(buf);
  ss << "{ssrc: " << ssrc;
  + if (!rid.empty()) {
  + ss << ", rid: " << rid;
  + }
  + if (!mid.empty()) {
  + ss << ", mid: " << mid;
  + }
  ss << ", extmap-allow-mixed: " << (extmap_allow_mixed ? "true" : "false");
  ss << ", extensions: [";
  for (size_t i = 0; i < extensions.size(); ++i) {
  