Perform sanity check training&evaluation for ReacherEnv

### Description

The #137 changed the implementation of `_reward_keypoints()` in `reacher_env.py` (due to the mismatch in Genesis and RosGrpc counterparts). We need to perform sanity check to see if the training still works.

### References

_No response_

Start with reacher_env.py and the _reward_keypoints() implementation changed by issue #137, including the Genesis and RosGrpc mismatch described there. Run the project's ReacherEnv training and evaluation checks, and confirm that training still works after the change.

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