Refactor Shopping List API (#2021)

* tidied up shopping list item models
redefined recipe refs and updated models
added calculated display attribute to unify shopping list item rendering
added validation to use a food's label if an item's label is null

* fixed schema reference

* refactored shopping list item service
route all operations through one central method to account for edgecases
return item collections for all operations to account for merging
consolidate recipe items before sending them to the shopping list

* made fractions prettier

* replaced redundant display text util

* fixed edgecase for zero quantity items on a recipe

* fix for pre-merging recipe ingredients

* fixed edgecase for merging create_items together

* fixed bug with merged updated items creating dupes

* added test for self-removing recipe ref

* update items are now merged w/ existing items

* refactored service to make it easier to read

* added a lot of tests

* made it so checked items are never merged

* fixed bug with dragging + re-ordering

* fix for postgres cascade issue

* added prevalidator to recipe ref to avoid db error

frontend/lib/api/user/group-shopping-lists.ts

@@ -4,7 +4,7 @@ import {
   ShoppingListCreate,
   ShoppingListItemCreate,
   ShoppingListItemOut,
-  ShoppingListItemUpdate,
+  ShoppingListItemUpdateBulk,
   ShoppingListOut,
   ShoppingListUpdate,
 } from "~/lib/api/types/group";
@@ -37,7 +37,7 @@ export class ShoppingListsApi extends BaseCRUDAPI<ShoppingListCreate, ShoppingLi
 export class ShoppingListItemsApi extends BaseCRUDAPI<
   ShoppingListItemCreate,
   ShoppingListItemOut,
-  ShoppingListItemUpdate
+  ShoppingListItemUpdateBulk
 > {
   baseRoute = routes.shoppingListItems;
   itemRoute = routes.shoppingListItemsId;