Add RainbowRobotics RBQ10

[gnteKim]

If you would like to see a new model added to the Menagerie collection, please provide us with the following information before sending a pull request. (Ideally, before you start working on converting or tuning the model for MuJoCo.)

URL for the existing model source (e.g. URDF)
https://rainbowrobotics.github.io/RBQ/manual/Hardware/specification.html

License terms of the upstream model
BSD 3-Clause License

What do you think is required to convert and tune this model for MuJoCo?
Hello,

We are from Rainbow Robotics, and we have been setting up a MuJoCo environment for the RBQ10 to make it easier for users to access and utilize the model.
Since we have already implemented and tested RBQ in MuJoCo, only adding the model to the Menagerie collection should be required.
https://rainbowrobotics.github.io/RBQ/software/developers-guide.html

Here is the link to our official website, where you can control and interact with the RBQ model in MuJoCo:

Are you proposing to help develop and maintain the new model?
Yes. I am currently working with Rainbow Robotics in RBQ research team, would also love to develop and maintain the new model.