Add bindings for RobotDriver tool GPIO methods

[erwinkendo]

This PR exposes the tool GPIO methods added in MarinhoLab/sas_cpp#13 to Python.

Changes

• src/sas_robot_driver_py.cpp
  • Trampoline overrides for get_tool_gpio() and set_tool_gpio(), so Python subclasses of RobotDriver can implement them. The return type is wrapped in PYBIND11_TYPE(...) because of the comma in std::array<bool, 2>, following the existing get_joint_limits pattern.
  • .defs for both methods.
  • Contributors section updated.
• marinholab/sas/core/_core.pyi
  • Type stubs: get_tool_gpio() -> list[bool] and set_tool_gpio(tool_gpio: list[bool]) -> None.

Dependencies

Requires MarinhoLab/sas_cpp#. Once that merges, submodules/sas_cpp needs bumping to include it. I can add that commit here, or you can bump it as part of the merge.

Testing

Built against the sas_cpp branch and checked from Python:

• The base class returns [False, False] by default, and set/get round-trips.
• A Python subclass that overrides both methods works as expected.
• A list with the wrong number of elements is rejected with TypeError by pybind11's std::array caster.