sea-bass/pyrobosim

AI Summary: Fix a bug in the PyRoboSim robot simulator where robot action execution options are not serialized to YAML. This involves updating unit tests in `src/pyrobosim/pyrobosim/test/core/test_yaml_utils.py` to verify the issue and then modifying the `Robot.to_dict()` function to correctly serialize the `action_execution_options`. The fix should ensure that these options are correctly saved and loaded from YAML files.