PERF: refactor atef.bin cli entrypoint to defer imports (try 2) #378

Job	Run time
standard / pre-commit checks / pre-commit	18s
standard / Documentation / Python 3.9: documentation building	2m 0s
standard / Conda (3.9, true) / Python 3.9: conda	4m 18s
standard / Conda (3.10) / Python 3.10: conda	4m 8s
standard / Conda (3.11, true) / Python 3.11: conda	3m 56s
standard / Conda (3.12, true) / Python 3.12: conda	4m 8s
standard / Pip (3.10) / Python 3.10: pip	3m 18s
standard / Pip (3.11, true) / Python 3.11: pip	3m 19s
standard / Pip (3.12, true) / Python 3.12: pip	3m 23s
standard / Pip (3.9, true) / Python 3.9: pip	3m 11s
standard / Documentation / Documentation deployment	0s
	31m 59s

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