add C++ support for RecordingStream::stdout

Author: teh-cmc

rerun_cpp/src/rerun/c/rerun.h

@@ -128,6 +128,12 @@ namespace rerun {
         return status;
     }
 
+    Error RecordingStream::stdout() const {
+        rr_error status = {};
+        rr_recording_stream_stdout(_id, &status);
+        return status;
+    }
+
     void RecordingStream::flush_blocking() const {
         rr_recording_stream_flush_blocking(_id);
     }

rerun_cpp/src/rerun/recording_stream.cpp

@@ -174,6 +174,16 @@ namespace rerun {
         /// This function returns immediately.
         Error save(std::string_view path) const;
 
+        /// Stream all log-data to stdout.
+        ///
+        /// Pipe the result into the Rerun Viewer to visualize it.
+        ///
+        /// If there isn't any listener at the other end of the pipe, the `RecordingStream` will
+        /// default back to `buffered` mode, in order not to break the user's terminal.
+        ///
+        /// This function returns immediately.
+        Error stdout() const;
+
         /// Initiates a flush the batching pipeline and waits for it to propagate.
         ///
         /// See `RecordingStream` docs for ordering semantics and multithreading guarantees.