Output sssom mapping files rather than (just) owl

[matentzn]

For working with boomer more seemlessly, it would be great if it could output the results as a table:

mapping_set_id: https://w3id.org/boomer/s8169763872632786387263
license: https://creativecommons.org/publicdomain/zero/1.0/
curie_map:
  UBERON: http...
  FMA: http...

subject_id	subject_label	predicate_id	object_id	object_label	confidence	mapping_justification
UBERON:123	heart	skos:exactMatch	FMA:321	heart	0.9	semapv:UnspecifiedMatching
UBERON:123	soul	skos:exactMatch	FMA:321	human soul	0.9	semapv:UnspecifiedMatching

[matentzn]

I could see something like:

-O/--output-format sssom, owl

and when sssom us chosen, to default to the skos vocabulary rather than owl? Maybe this eventually needs a different option, but for now, this would suit us very well.