feat(app, food): add local database

[MarcelGarus]

Fixes: #13

Checklist

• [x] Commit messages follow conventionalcommits.org
• [x] Tested on actual devices
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Changes

Added local caching support, currently only implemented for the food.