[Example 10] RRbot with GPIO interfaces (backport #256)

[mergify[bot]]

This is an automatic backport of pull request #256 done by Mergify. Cherry-pick of 60b788f8f2491ecb562e20e5a49d40a54905e99c has failed:

On branch mergify/bp/humble/pr-256
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 60b788f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
    modified:   README.md
    modified:   doc/index.rst
    new file:   example_10/CMakeLists.txt
    new file:   example_10/README.md
    new file:   example_10/bringup/config/rrbot_controllers.yaml
    new file:   example_10/bringup/config/rrbot_forward_position_publisher.yaml
    new file:   example_10/bringup/launch/rrbot.launch.py
    new file:   example_10/bringup/launch/test_forward_position_controller.launch.py
    new file:   example_10/controllers/gpio_controller.cpp
    new file:   example_10/controllers/include/ros2_control_demo_example_10/gpio_controller.hpp
    new file:   example_10/description/launch/view_robot.launch.py
    new file:   example_10/description/ros2_control/rrbot.ros2_control.xacro
    new file:   example_10/description/urdf/rrbot.urdf.xacro
    new file:   example_10/doc/userdoc.rst
    new file:   example_10/hardware/include/ros2_control_demo_example_10/rrbot.hpp
    new file:   example_10/hardware/include/ros2_control_demo_example_10/visibility_control.h
    new file:   example_10/hardware/rrbot.cpp
    new file:   example_10/package.xml
    new file:   example_10/ros2_control_demo_example_10.xml
    modified:   ros2_control_demos/package.xml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   .github/workflows/ci-coverage-build.yml
    both modified:   .github/workflows/ci-ros-lint.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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