feat: dynamic loading of categories and foods

[JulesGresset]

Describe your changes

Categories and foods are loaded dynamically, compared with the cache and the cache is modified accordingly.

Issue ticket number and link

Closes #49

Checklist before requesting a review

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have performed a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Documentation has been updated as required
  If a single item in this checklist is not checked, the pull request cannot be accepted