Publish rai_open_set_vision package to Pypi

[Juliaj]

Originally posted by @maciejmajek in https://github.com/RobotecAI/rai/pull/694#discussion_r2374999823

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

Remaining tasks

• [x] Remove ROS 2 configuration files, https://github.com/RobotecAI/rai/pull/711.
• [ ] Shall we merge https://github.com/RobotecAI/Grounded-SAM-2/pull/3? It is completed on my side.
• [x] Update rai_perception README.md to install with pip, https://github.com/RobotecAI/rai/pull/719, pending review
• [ ] Publish rai-gsam2 and rai-perception to PyPI
• [ ] PR to fix TODO RAI pyproject.toml

[rachwalk]

Merging this issue with previous one: https://github.com/RobotecAI/rai/issues/634