Updated the rankby_obsm function to optionally accept keys to test as… #18

Job	Run time
test (example.ipynb)	3m 6s
test (omnipath/licenses.ipynb)	1m 20s
test (bench/rna.ipynb)	3m 20s
test (bulk/rna.ipynb)	2m 17s
test (scell/rna_psbk.ipynb)	1m 58s
test (scell/rna_sc.ipynb)	1m 46s
test (spatial/rna_visium.ipynb)	1m 59s
test (omnipath/orthologs.ipynb)	2m 1s
test (scell/rna_pstime.ipynb)	2m 26s
	20m 13s

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