Refactoring: vaccination

src/flask_covid19/blueprints/app_all/all_model.py

src/flask_covid19/blueprints/data_divi/divi_model.py

...flask_covid19/blueprints/data_divi/divi_service_import.py

...flask_covid19/blueprints/data_divi/divi_service_update.py

src/flask_covid19/blueprints/data_ecdc/ecdc_model.py

...flask_covid19/blueprints/data_ecdc/ecdc_service_import.py

...flask_covid19/blueprints/data_ecdc/ecdc_service_update.py

...flask_covid19/blueprints/data_owid/owid_service_import.py

...flask_covid19/blueprints/data_owid/owid_service_update.py

src/flask_covid19/blueprints/data_rki/rki_service_import.py

src/flask_covid19/blueprints/data_rki/rki_service_update.py

..._covid19/blueprints/data_vaccination/vaccination_model.py

...blueprints/data_vaccination/vaccination_service_import.py

...blueprints/data_vaccination/vaccination_service_update.py

src/flask_covid19/blueprints/data_who/who_model.py

src/flask_covid19/blueprints/data_who/who_service_import.py

src/flask_covid19/blueprints/data_who/who_service_update.py