add GO to export similar to gene_product and provenance in order to aid with round-trip

[nathandunn]

see #2372

Suggestion should be:

go_annotation=rank=1;term=GO:12312;db_xref=asdf:1212122;evidence=ECO:0000353;not=true;note=[];based_on=["asdf:1212"];aspect=BP;relationship=RO:00004034

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Reference:

• provenance=rank%3D1%3Bfield%3DNAME%3Bdb_xref%3Dasfa:lkj%3Bevidence%3DECO:0000269%3Bnote%3Dnull%3Bbased_on%3D["as:12313"]
• gene_product=rank%3D1%3Bterm%3Dmy gene product%3Bdb_xref%3Dasdf:1212122%3Bevidence%3DECO:0000353%3Balternate%3Dtrue%3Bnote%3D[]%3Bbased_on%3D["asdf:1212"]

Group11.18  .   gene    2859759 2864902 .   -   .   owner=ndunn@me.com;symbol=mygenesymbol;description=description of gene;Name=GB44997-RA-00001a;date_creation=2020-03-11;121=asdsad;provenance=rank%3D1%3Bfield%3DNAME%3Bdb_xref%3Dasfa:lkj%3Bevidence%3DECO:0000269%3Bnote%3Dnull%3Bbased_on%3D["as:12313"];Alias=syn1,syn2;Note=dfasdfasdf;gene_product=rank%3D1%3Bterm%3Dmy gene product%3Bdb_xref%3Dasdf:1212122%3Bevidence%3DECO:0000353%3Balternate%3Dtrue%3Bnote%3D[]%3Bbased_on%3D["asdf:1212"];ID=00bd7a2a-617e-48de-bc6e-4fa454f3d518;date_last_modified=2020-03-11;Dbxref=asdf:111212;status=accepted