rename Kegg to KeggOrthology

backend/app/app/api/endpoints/keggs.py

backend/app/app/api/router.py

backend/app/app/cli/create_test_db.py

backend/app/app/cli/empty_db.py

backend/app/app/core/models/__init__.py

backend/app/app/core/models/annotations.py

backend/app/app/core/models/experiment.py

backend/app/app/core/models/gene.py

backend/app/app/core/models/gene_links.py

backend/app/app/core/models/kegg.py

backend/app/app/core/repositories/kegg.py

backend/app/app/core/schemas/entities/annotations.py

backend/app/app/core/schemas/entities/kegg.py

backend/app/app/core/schemas/nested/gene.py

backend/app/app/core/use_cases/crud/kegg.py

backend/app/app/dependency_injections.py

backend/app/tests/api/endpoints/test_eggnogs.py

backend/app/tests/api/endpoints/test_keggs.py

backend/app/tests/core/use_cases/crud/test_kegg.py