Create CITATION.cff for DOI and a small bug fix to the hardware interface

[abdullah-ukaea]

Summary

This PR does two things:

• Adds a CITATION.cff file so the CRCOpen ROS2 driver can be cited properly and linked to a DOI once configured in GitHub.
• Fixes a small break in the hardware interface caused by recent ros2_control API changes.

Details

CITATION.cff

• Introduces a CITATION.cff file following GitHub’s recommended format so users can easily generate citations and associate a DOI with this repository.
• This addresses issue create a DOI (Digital Object Identifier) for our Open Source ROS2 driver. #6 (create a DOI for our open source ROS2 driver) and follows the guidance in the GitHub docs on citation files.

Hardware interface bug fix

• Updates the hardware interface on_init method to use the new hardware_interface::HardwareComponentInterfaceParams API and passes params through to SystemInterface::on_init.
• This resolves a build break on Rolling caused by the ros2_control / hardware_interface API change, restoring compatibility.

Closes #6