sciurus17_examplesのROS 2対応

[Kuwamai]

What does this implement/fix?

• sciurus17_examplesのROS 2対応です。
• 各関節を制御するサンプルを追加しています。
• カメラを使用したサンプル等は未対応です。

Does this close any currently open issues?

しません

How has this been tested?

ros2 launch sciurus17_examples example.launch.py example:='gripper_control'
ros2 launch sciurus17_examples example.launch.py example:='neck_control'
ros2 launch sciurus17_examples example.launch.py example:='waist_control'
ros2 launch sciurus17_examples example.launch.py example:='pick_and_place_right_arm_waist'
ros2 launch sciurus17_examples example.launch.py example:='pick_and_place_left_arm'

Any other comments?

• pick_and_place_two_armサンプルは下記issueと同様のエラーが生じたため未対応です
  • https://github.com/ros-planning/moveit2/issues/1145
  • https://github.com/rt-net/sciurus17_ros/issues/127

Checklists

• [x] I have read the CONTRIBUTING guidelines.
  • If there is no guideline in the repository, rt-net organization's guideline applies.
• [x] I have checked to ensure there aren't other open Pull Requests for the same change.