merge release 1.5.1 from dev to main

update version to 1.5.0

Merge Request for IndustRealSim

Refactor train.py and cfg to allow hydra tab completion

Fix usage of enableCameraSensors

PBT release

Multi-node training support

Docs fixed and rlgames test working with both AllegroHandDeXtreme environments.

Update gym version to avoid conflicts

fixing setup file

cleaning up and also improving docs

Fix missing flags in configs and other minor fixes

Dextreme and ADR release

AMP hist fix

Observer cleanup