Add working example of consuming as bzlmod

[JohnRudolfLewis]

• Add an example for how to consume via bzlmod
• Fixes Using rules_ros via bzlmod results in invalid label for module extension found #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

[JohnRudolfLewis]

@hofbi I was able to reproduce the inability to build with your changes in GH-33. A few more changes were needed.

[hofbi]

Thanks for providing the fix. I added it to #33, let's see who get's in first.

[mvukov]

Addressed in #43 , I believe.