Updated the rankby_obsm function to optionally accept keys to test as… #20

Job	Run time
test (bulk/rna.ipynb)	2m 17s
test (bench/rna.ipynb)	3m 46s
test (example.ipynb)	2m 55s
test (omnipath/orthologs.ipynb)	1m 57s
test (scell/rna_psbk.ipynb)	1m 48s
test (omnipath/licenses.ipynb)	1m 18s
test (scell/rna_pstime.ipynb)	2m 20s
test (scell/rna_sc.ipynb)	1m 40s
test (spatial/rna_visium.ipynb)	1m 56s
	19m 57s

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