Stew tweaks

Rebalances soup and stew recipies, and makes them stackable up to 16!

Beetroot soup

Six beetroots for one soup is very unfair! So now there are three. Additionally, can now be found in plain, savanna and snow villages.

Rabbit stew

Rebalanced recipe. You can also use jacket potato and cooked rabbit instead. Additionally, can now be found in desert villages.

Due to limitations in the functionality of datapacks, rabbit stews obtained from trades with villagers are still not stackable :(

Mushroom stew

Can now be found in taiga villages.

Due to limitations in the functionality of datapacks, mushroom stews obtained from mooshroom are still not stackable :(