Add TIAGo OMNI Base

[stefaniapedrazzi]

Address #6046: add model of new TIAGo OMNI Base.

TODO:

• [x] add robot model
• [x] add sample world
• [ ] add icon (update icon and scene once the new simplified Base STL file is available)
• [x] rename existing TiagoBase PROTO to TiagoPmb2Base
• [x] update TIAGo PROTO files to add option to choose base
• [x] update User Guide documenation
• [x] update webots_cloud documenation
• [ ] simplify STL mesh: base.stl
• [x] use Pose node instead of Transform node

[stefaniapedrazzi]

Status: waiting for updated base mesh from PAL robotics

[thomaspeyrucain]

The TIAGo OMNI Base model has been simplified on our repository: https://github.com/cyberbotics/webots/issues/6046#issuecomment-1731277700

[ShuffleWire]

It's been 1 year, and nothing more happens. I should be able to remesh it to lower it size. Would you be interested @omichel

[omichel]

Honestly, I don't care, but if you are willing to do it, you are welcome.