* Added validators for users and recipes
provide a simple get api, allowing to test for existence of
- user by username
- recipe by slug
- group by name (not tested yet)
* updated formatting
* Use group_id+slug for recipes, use ValidationRespone
* Fixed Flake8 errors and warnings
* add missing field for TestUser init
* feat: ✨ support for lockable recipes
* feat(backend): ✨ check user can update before updating recipe
* test(backend): ✅ add recipe lock tests
* feat(frontend): ✨ disabled lock action when not owner
* test(backend): ✅ test non-owner can't lock recipe
* hide quantity on zero value
* fix(backend): 🐛 temp/partial fix for recipes with same name. WIP
