allow filtering on version through eggnog API

backend/metagenedb/api/catalog/filters/__init__.py

backend/metagenedb/api/catalog/filters/function.py

...end/metagenedb/api/catalog/qparams_validators/function.py

backend/metagenedb/api/catalog/views/base.py

backend/metagenedb/api/catalog/views/function.py

backend/metagenedb/api/catalog/views/gene.py

backend/metagenedb/api/catalog/views/taxonomy.py

backend/metagenedb/api/catalog/views/test_base.py