implemented led write manager

[Joschi3]

Allows updating the LED color of all connected dynamixel servos with just a single write instruction.

[Copilot]

Pull Request Overview

This PR implements a centralized LED write manager to efficiently update LED colors across all connected Dynamixel servos using a single synchronized write instruction, replacing the previous approach of individual write operations per servo.

Key changes:

• Introduced LED_State struct to track LED color values (red, green, blue) for each joint
• Added setUpLEDWriteManager() to initialize synchronized LED writing across all servos
• Refactored setColorLED() to use batch write operations instead of individual register writes

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
dynamixel_hardware_interface.cpp	Implements LED write manager setup and refactors setColorLED() to use synchronized writes
joint.hpp	Adds LED_State struct to store per-joint LED color values
dynamixel_hardware_interface.hpp	Declares LED write manager member and setup function

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