feat: FoodRestriction

[dbirman]

Add FoodRestriction class

[saskiad]

First, the titles for three fields still say water instead of food. Please fix those.

I assume we've verified these fields with the folks doing food restriction? This looks same as water restriction, and I wouldn't expect them to wildly different, but I could also imagine there being some differences. E.g. sometimes food restriction is about using a different diet - would we want to have a field for what food is used? Or I guess if we have a protocol for food restriction we wouldn't need to specify that if it's always the same thing. But regardless, that's an example - just want to confirm we're not missing something.

[dbirman]

I assume we've verified these fields with the folks doing food restriction? This looks same as water restriction, and I wouldn't expect them to wildly different, but I could also imagine there being some differences. E.g. sometimes food restriction is about using a different diet - would we want to have a field for what food is used? Or I guess if we have a protocol for food restriction we wouldn't need to specify that if it's always the same thing. But regardless, that's an example - just want to confirm we're not missing something.

I'll hold off on merging until we have a chance to chat. I think the current version is fine for what Ines/Vivek did but we may have to make changes later.