create Iron release

[JanStaschulat]

preconditions (feature requests)

• [x] parameter service cli https://github.com/ros2/rclc/pull/358
• [x] multi-threaded executor API interface https://github.com/ros2/rclc/pull/355

release creation:

• [x] create rolling branch
• [x] create iron branch
• [x] update Github branch configuration for rolling
• [x] update Github branch configuration for iron
• [x] update ros-tooling versions (setup-ros 0.6.2 and ros-action 0.3.2)
  • [x] master https://github.com/ros2/rclc/pull/361
  • [x] rolling https://github.com/ros2/rclc/pull/359
  • [x] iron https://github.com/ros2/rclc/pull/360
  • [x] humble https://github.com/ros2/rclc/pull/364
  • [x] foxy https://github.com/ros2/rclc/pull/365
• [x] update release notes
• [x] tag branch; version 5.0.1
• [x] bloom release Iron PR: https://github.com/ros/rosdistro/pull/37664
• [x] bloom release Rolling: https://github.com/ros/rosdistro/pull/37675
• [x] create release on github
• [x] set rolling as the default branch
• [x] depricate master branch
• [x] README: update CI-status table for iron

[JanStaschulat]

Iron release finished.