Introduce recipes to the app

[michalstruck]

Notes:

• recipes are only "synthetic", they are multipliers for product records,
• filling out recipes will only help with filling out product records ^ this is what we discussed on a call.

Thinking about it now, as a user, once I fill out and save the inventory, I would expect the filled out recipe quantities to be saved as well. If I made a mistake and wanted to correct it at a later date, the previous recipe quantities would most likely be missing.

It seems that translating recipe quantities to product record quantities should be done only on the frontend.

[felix-lipski]

Let's implement it frontend-only for now, for rolling it out asap.

Later we can introduce recipe_record on the backend. Most of the work done on the frontend-only solution will still be used on the full solution.

[michalstruck]

done in #171