feat: add `diffpy.app runmacro <`.dp-in `file>` entry point #4

Job	Run time
tests-on-pr / get-python-version / get-python-versions / get-python-versions	5s
tests-on-pr / get-python-version / extract-latest	2s
tests-on-pr / validate	2m 52s
	2m 59s

Provide feedback