docstr: KPIs are supported.
code: def get_kpi_calculator(self) -> Cutting2dKpiCalculator:
      """KPIs are supported."""
      return self.kpi_calculator
  
file_path: maze/tutorials/tutorial_maze_env/part04_events/env/core_env_snippet.py
imports: from maze.core.events.pubsub import Pubsub
  from .events import CuttingEvents, InventoryEvents
  from .kpi_calculator import Cutting2dKpiCalculator
label_desc: Use image node_id 4 for calling the Cutting2DCoreEnvironment obj's underlying member method code with example usage: obj.get_kpi_calculator() and returns: self