Add support for `suitableForDiet` property to indicate dietary restrictions

I'd like a new option added to the drop-down list of "Nutrition Information". Please add "Dietary Restriction Compliance" or similar as a way of adding a list of dietary restrictions that the recipe is complaint with. In use, we would select this new option then manually type the list of allergens it doesn't have or diets it conforms to. I know we can use the "categories" section to get a similar function, but I think this is better kept out of the other types of categories AND it should print along side the Nutrition Information section.

Example:
Dietary Restriction Compliance- peanut allergy, nightshades allergy, vegan, vegetarian

Further, it would be awesome if the text box also worked just like the categories item works, where we can select from existing or add new phrases. However, as a quick, partial fix, we could just have the option added with a standard text box.

Start by examining the existing Nutrition Information dropdown and the categories behavior described in the issue. Determine how a dietary-restriction value would be entered, stored, and printed alongside Nutrition Information, including whether selectable existing phrases are required. Done means the new option works consistently in the recipe editor and printed output.