chore: import upstream snapshot with attribution

docs/snippets/all/migration/transactional_transforms.cpp

@@ -0,0 +1,7 @@
+// Log a translation transform.
+rec.log("simple", rerun::Transform3D::from_translation({1.0f, 2.0f, 3.0f}));
+
+// Note that we explicitly only set the scale here:
+// Previously, this would have meant that we keep the translation.
+// However, in 0.27 the Viewer will no longer apply the previous translation regardless.
+rec.log("simple", rerun::Transform3D::update_fields().with_scale(2.0f));