class_docstr: The config for execution backends.
  
  This class should ONLY provide the APIs for the parts other than
  just the execution. Each backend may have a different implementation
  of the API.
  
  If some configuration is for a specific backend. They should be in
  the backend config. e.g. `get_mars_special_config()` should be in
  the `MarsExecutionConfig`.
docstr: Get the execution config dict.
docstr_tok: ["Get","the","execution","config","dict","."]
code: def get_config_dict(self) -> Dict:
      """Get the execution config dict."""
      return self._config
  
imports: from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from typing import List, Dict, Any, Type, Union
  from ....core import ChunkGraph, Chunk, TileContext
  from ....core.operand.shuffle import ShuffleFetchType
  from ....resource import Resource
  from ....typing import BandType
  from ....utils import merge_dict
  from ...subtask import SubtaskGraph, SubtaskResult
label_desc: Use image node_id 4 for calling the ExecutionConfig obj's underlying member method code with example usage: obj.get_config_dict() and returns: self