Moved the rclrs_example_msgs package to the examples folder. This package was only ever used by examples.

[maspe36]

Continuing to clean up the root level folders. This space comes at a premium and we should try to reduce the amount of noise.

[esteve]

@maspe36 thanks!

[esteve]

@maspe36 what do you think of eventually replacing this package with upstream's https://github.com/ros2/test_interface_files/tree/rolling ? Maybe even vendorize it. Both packages seem quite similar and it'd mean not maintaining our own package.

[maspe36]

We could even take it a step further and move the examples out of the repo. Long term if we can get both rosidl_generator_rs and rosidl_runtime_rsupstreamed into rosidl, the only thing left in this repo would be the examples and rclrs.

rclcpp and rclpy examples are already in a different repo, and if we move our examples into a different repo, this would leave us with just rclrs, which mirrors the structure of say rclcpp.

[esteve]

@maspe36 we don't need to move rosidl_generator_rs and rosidl_runtime_rs to another organization on Github for them to be included in the buildfarm. However, moving them to their own repositories within the ros2-rust would enable us to release them independently. We should probably do that now anyway.