Add support for MJLAB

[robomotic]

Hi there,
Please add support for: https://github.com/mujocolab/mjlab
This is the interface: https://mujocolab.github.io/mjlab/main/source/training/rsl_rl.html
Happy to be your beta tester!

[donghukim-holiday]

Hi @robomotic,
Thanks for the suggestion! MJLab looks like a great fit for FlashSAC, and by the looks of it the integration should be reasonably natural. We'll update you once we have something ready to try out.
Thanks again!

[fheller1]

Hi all,
thanks for the great work on FlashSAC.

We also required support for mjlab and forked to allow training and playing mjlab tasks.
Please feel free to test or pull!

[robomotic]

Wow fantastic I am going to try it shortly!

[robomotic]

I am thinking to run the same robot but then save the SAC checkpoints on my existing benchmarks: https://huggingface.co/robomotic/mjlab-policies/tree/main