2025 version of cascar project

Changes

• Refactor launch files into single demo package.
• Move to ROS2 Jazzy (instead of Humble)
• The cars are now preconfigured to automatically launch all required software on startup.This means you will not need to manually interact with the Pi’s during normal operation.
• Include a configuration file to centralize configuration.
• ROS2 namespaces are used to differentiate the cars (previously used ROS2_DOMAIN_ID environment varialbe for this).