Merge branch '7-elementary-elements-CRUD' into 'dev'

backend/app/.coveragerc

backend/app/app/api/endpoints/catalogs.py

backend/app/app/api/endpoints/eggnogs.py

backend/app/app/api/endpoints/experiments.py

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

backend/app/app/api/endpoints/ncbi_taxonomy.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/models/ncbi_taxonomy.py

backend/app/app/core/repositories/catalog.py

backend/app/app/core/repositories/eggnog.py

backend/app/app/core/repositories/experiment.py

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