Add C_NewItems module with functions for managing new item flags in inventory

C_NewItems.lua

@@ -0,0 +1,22 @@
+---@diagnostic disable: missing-return, lowercase-global
+---@meta
+---
+--- C_NewItems is a namespace for functions related to new item flags in the player's inventory.
+---
+--- @class C_NewItems
+C_NewItems = {
+	--- Clears the new item flag on all items in the player's inventory.
+	--- @return nil
+	ClearAll = function() end,
+
+	--- Returns true if the item in the inventory slot is flagged as new.
+	--- @param containerIndex number: The index of the container.
+	--- @param slotIndex number: The index of the slot.
+	--- @return boolean: isNew
+	IsNewItem = function(containerIndex, slotIndex) end,
+
+	--- Clears the "new item" flag.
+	--- @param containerIndex number: The index of the container.
+	--- @param slotIndex number: The index of the slot.
+	RemoveNewItem = function(containerIndex, slotIndex) end,
+}