AI update based on proto changes

[viambot]

This is an AI-generated PR to update the SDK based on proto changes. The AI may make mistakes so review carefully.

Summary of Changes:
This update introduces the Get3DModels RPC method for the Arm component. This new functionality allows clients to request and retrieve 3D model data (meshes) associated with the arm. The changes include adding the necessary protobuf definitions, implementing the gRPC service handler, updating the client-side logic, and adding corresponding mock implementations and unit tests.

[github-actions]

Warning your change may break code samples. If your change modifies any of the following functions please contact @viamrobotics/fleet-management. Thanks!

component	function
base	is_moving
board	gpio_pin_by_name
button	push
genericcomponent	do_command
camera	get_image
encoder	get_position
motor	is_moving
sensor	get_readings
servo	get_position
switch	get_position
arm	get_end_position
gantry	get_lengths
gripper	is_moving
movement_sensor	get_linear_acceleration
input_controller	get_controls
audio	get_properties
pose_tracker	get_poses
power_sensor	get_power
motion	get_pose
vision	get_properties
mlmodel	metadata
genericservice	do_command
slam	get_point_cloud_map
audio_in	get_properties
audio_out	get_properties