Add check_mujoco_reset_state

[Kallinteris-Andreas]

Description

This was added mainly to address Gymnasium-Robotics's Farama-Foundation/Gymnasium-Robotics#207 Farama-Foundation/Gymnasium-Robotics#208, but it can also be used here and in metaworld?

Type of change

Please delete options that are not relevant.

• Documentation only change (no code changed)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[Kallinteris-Andreas]

Also, i forgot to add, that that fails for all RobotEnv based environment (and RobotPyEnv but we do not care about those), which is the reason this is added

FAILED test.py::test_reproducibility[FetchSlide-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchPickAndPlace-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchReach-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchPush-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[HandReach-v1] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchSlideDense-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchPickAndPlaceDense-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchReachDense-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[FetchPushDense-v2] - AssertionError: reset is not deterministic
FAILED test.py::test_reproducibility[HandReachDense-v1] - AssertionError: reset is not deterministic