Add working example of consuming as bzlmod

[JohnRudolfLewis]

• Add an example for how to consume via bzlmod
• Fixes https://github.com/mvukov/rules_ros/issues/32 by removing the dev_dependency = True from rules_python
• bumps rules_python to the latest version
• makes module name and repo_name consistent so local and remote builds work properly

Continues the work started by @hofbi in GH-33