Replace LD19 with Hesai JT16 ROS 2 driver

[MrBearing]

Summary

• remove LD19 repositories, launch integration, and udev rule
• add a SANEHAL JT16 launch using hesai_ros_driver v2.0.12 and the serial configuration
• integrate JT16 into the Raspberry Pi bringup and document PointCloud2, TF, QoS, timestamp, and device permissions
• install undeclared Hesai system dependencies in Jazzy CI

Validation

• colcon build --packages-up-to sanehal_bringup
• colcon test --packages-select hesai_ros_driver sanehal sanehal_bringup sanehal_vehicle_description
• colcon test-result --verbose: 17 tests, 0 errors, 0 failures
• launch argument expansion for jt16.launch.py and sanehal.launch.py
• vcs, YAML, XML, Python AST, and udev rule validation
• confirmed Hesai v2.0.12 and SDK submodule revision in the workspace

Hardware status

• the driver opens /dev/jt16_rs485 and /dev/jt16_rs232 and advertises /lidar_points with Reliable/Volatile QoS
• the connected RS485 port produced no bytes during the test, so PointCloud2 rate, fields, timestamps, packet-loss values, and alignment remain blocked on JT16 power/wiring/serial-output diagnosis
• /lidar_imu remains disabled until the hardware output is validated
• upstream v2.0.12 required SIGKILL after it did not exit on SIGINT/SIGTERM

Closes #30

[MrBearing]

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[MrBearing]

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