Create a proper APO integration

[matentzn]

Right now, APO is integrated into uPheno by simply copying it there. If we want APO annotations to really integrate with uPheno, we need to achieve the following:

• [ ] Map the qualifier branch to PATO: https://www.ebi.ac.uk/ols/ontologies/apo/terms?iri=http%3A%2F%2Fpurl.obolibrary.org%2Fobo%2FAPO_0000001&lang=en&viewMode=All&siblings=false
• [ ] Map the observable branch to OBA
• [ ] Generate A ZP like APO-Upheno module
• [ ] Integrate into uPheno

Big issue, very important for Monarch (just came out of a call).

cc @kevinschaper