Feature: expose event callback setter in subscription, service, client and timer (backport #1496)

[mergify]

Part of #1399.

• Expose set_on_new_message_callback and clear_on_new_message_callback for subscription.
• Expose set_on_new_request_callback and clear_on_new_request_callback for service.
• Expose set_on_new_response_callback and clear_on_new_response_callback for client.
• Expose set_on_reset_callback and clear_on_reset_callback for timer.

  ---

  This is an automatic backport of pull request Feature: expose event callback setter in subscription, service, client and timer #1496 done by Mergify.

[mergify]

Cherry-pick of c834c24 has failed:

On branch mergify/bp/kilted/pr-1496
Your branch is up to date with 'origin/kilted'.

You are currently cherry-picking commit c834c24.
  (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:   rclpy/rclpy/impl/_rclpy_pybind11.pyi
	modified:   rclpy/src/rclpy/client.cpp
	modified:   rclpy/src/rclpy/client.hpp
	modified:   rclpy/src/rclpy/events_executor/rcl_support.cpp
	modified:   rclpy/src/rclpy/service.cpp
	modified:   rclpy/src/rclpy/service.hpp
	modified:   rclpy/src/rclpy/subscription.cpp
	modified:   rclpy/src/rclpy/subscription.hpp
	modified:   rclpy/src/rclpy/timer.cpp
	modified:   rclpy/src/rclpy/timer.hpp
	modified:   rclpy/test/test_client.py
	modified:   rclpy/test/test_timer.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   rclpy/test/test_service.py
	both modified:   rclpy/test/test_subscription.py

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

[fujitatomoya]

@nadavelkabets can you resolve the conflicts?