feat: add `diffpy.app runmacro <`.dp-in `file>` entry point #5

Job	Run time
tests-on-pr / get-python-version / get-python-versions / get-python-versions	4s
tests-on-pr / get-python-version / extract-latest	3s
tests-on-pr / validate	2m 33s
	2m 40s

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