RobotWebTools / rclnodejs / 20255001676

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Add rcl_timer_set_on_reset_callback() support (#1348)

This PR adds support for the ROS 2 `rcl_timer_set_on_reset_callback()` API to rclnodejs, enabling users to register callbacks that are invoked when a timer is reset. The implementation provides both JavaScript and TypeScript APIs with corresponding native C++ bindings.

**Key Changes:**
- Added `setOnResetCallback()` and `clearOnResetCallback()` methods to the Timer class
- Implemented native C++ bindings using ThreadSafeFunction for cross-thread callback invocation
- Added comprehensive test coverage for the new callback functionality

Fix: #1330

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