`CHGNetCalculator.calculate` add kwarg `task: PredTask = "efsm"` #686

Job	Run time
tests (ubuntu-latest, 3.10, highest)	4m 27s
tests (ubuntu-latest, 3.12, lowest-direct)	5m 35s
tests (macos-14, 3.10, highest)	4m 10s
tests (macos-14, 3.12, lowest-direct)	5m 37s
tests (windows-latest, 3.10, highest)	6m 18s
tests (windows-latest, 3.12, lowest-direct)	6m 27s
	32m 34s

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