create a complete fake childProcess

[todo]

komondor-plugin-node/src/childProcess/index.ts

Lines 50 to 55 in 359ccd3

	const spiedArgs = call.invoke([event, cb])
	const result = fn.call(subject, ...spiedArgs)
	call.return(result)
	return result
	}
	}

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This issue was generated by todo based on a TODO comment in 359ccd3 when #9 was merged. cc @unional.