add publisher/subscription_event_type_is_supported().

[fujitatomoya]

Description

depends on ros2/rcl#1317

Fixes # (issue)

Is this user-facing behavior change?

No

Did you use Generative AI?

Yes Claude Code Opus4.6

Additional Information

[Copilot]

Pull request overview

Adds Python-accessible helpers to query whether specific publisher/subscription QoS event types are supported by the active RMW implementation, with accompanying unit tests.

Changes:

• Expose publisher_event_type_is_supported() / subscription_event_type_is_supported() via _rclpy (pybind11) and rclpy.event_handler.
• Add unit tests covering return type for all event enum values and asserting MATCHED is supported.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
rclpy/test/test_qos_event.py	Adds tests validating the new support-query helpers across event enums.
rclpy/src/rclpy/event_handle.cpp	Implements and binds the two new support-query functions into the pybind11 module.
rclpy/rclpy/event_handler.py	Adds Python wrappers (public API surface) for the new _rclpy functions.

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[fujitatomoya]

@ahcorde can you review this?

[fujitatomoya]

Pulls: ros2/rcl#1317, ros2/rclcpp#3132, #1647
Gist: https://gist.githubusercontent.com/fujitatomoya/da0945366990a7a90848379cce0e0673/raw/deef0ce8ee6811fcb8d377a8ecf8ddda07e6fe23/ros2.repos
BUILD args: --packages-above-and-dependencies rcl rclcpp rclpy
TEST args: --packages-above rcl rclcpp rclpy
ROS Distro: rolling
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/19228

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