rclc

Provides an executor with capabilities for implementing deterministic timing behavior, a key advantage over rclcpp's executor for real-time applications, as highlighted in the README.

Complements rcl without adding new abstraction layers, keeping the code lightweight and close to the hardware, which is ideal for embedded systems with resource constraints.

Introduces rclc Lifecycle Node that bundles rcl Node with the ROS 2 lifecycle state machine, enabling state-controlled nodes in C for robust robotics systems.

Includes rclc_examples with practical demonstrations of key features like convenience functions and the executor, aiding in learning and reducing initial setup time.