Add `mondo-all.sssom.tsv` and `mondo-xrefs.sssom.tsv` to `src/ontology/mappings`

[matentzn]

The mapping pipeline currently generates a sssom file with only the exact mappings.

For various use cases, including boomer and mondo source sync, we need mondo-all.sssom.tsv as well, which simply adds (for all sources allowed in mondo.sssom.tsv) also skos:broadMatch, skos:closeMatch, skos:narrowMatch.

We also need mondo-xrefs.sssom.tsv, which contains all mappings where oboInOwl:hasDbXref is the predicate, but the subject_id, object_id combination _does not appear in mondo-all.sssom.tsv.

• [ ] Also, we should add the correct mapping_set_id to the mondo mapping set: right now it is some autogenerated UUID, it should be stable.

[matentzn]

• [ ] Also, we should add the correct mapping_set_id to the mondo mapping set: right now it is some autogenerated UUID, it should be stable.

[hrshdhgd]

Mondo Mapping set id: http://purl.obolibrary.org/obo/mondo/mappings/mondo.sssom.tsv