Publish rai_open_set_vision package to Pypi

[Juliaj]

Originally posted by @maciejmajek in #694 (comment)

When we have that the next steps would be (for the rai_open_set_vision package):

• Remove ROS 2 configuration files
• Remove git dependencies
• Rename the package to something a little bit more graceful
• Publish to pypi

[rachwalk]

Merging this issue with previous one: #634