Fix `chopper_sim`: adding `ChopperController`

[TatsumiISHIKAWA]

Description

• In necst/executors/chopper_sim, the node of chopper controller as ChopperController which should be the instance of ChopperController.

Where Bug? necst/executors/chopper_sim.py

def configure_executor() -> MultiThreadedExecutor:
    executor = MultiThreadedExecutor()
    nodes = [
        ChopperController, # here.
    ]
    _ = [executor.add_node(n) for n in nodes]
    return executor

Expected behavior

def configure_executor() -> MultiThreadedExecutor:
    executor = MultiThreadedExecutor()
    nodes = [
        ChopperController(),
    ]
    _ = [executor.add_node(n) for n in nodes]
    return executor