chore: import upstream snapshot with attribution

docs/snippets/all/tutorials/dna_connect_grpc.cpp

@@ -0,0 +1,11 @@
+// The DNA-abacus example, connecting to a separately-running viewer over gRPC.
+
+#include <rerun.hpp>
+
+int main(int argc, char* argv[]) {
+    // Connect to the viewer running at the default URL.
+    const auto rec = rerun::RecordingStream("rerun_example_dna_abacus");
+    rec.connect_grpc().exit_on_failure();
+
+    // … log data as in the spawn-based example …
+}