Added new functions for Inventory

docs/wowapi/functions/Inventory.md

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+## GetInventoryItemCooldown
+Get cooldown information for an inventory item.
+
+/**
+ * Get cooldown information for an inventory item.
+ *
+ * @see https://wow.gamepedia.com/API_GetInventoryItemCooldown
+ * @returns start, duration, isEnabled
+ * @tupleReturn
+ */
+declare function GetInventoryItemCooldown(unit: WoWAPI.UnitId, slotId: number): LuaMultiReturn<[number, number, WoWAPI.Flag]>;
+
+
+### Parameters
+* unitId [WoWAPI.UnitId](../global/types/UnitId.md) - The unit whose inventory is to be queried.
+* slotId [WoWAPI.InvSlotId](../global/types/InvSlotId) - Inventory slot to target
+
+### Returns 
+* start number - The start time of the cooldown period, or 0 if there is no cooldown (or no item in the slot)
+* duration number - The duration of the cooldown period (NOT the remaining time). 0 if the item has no use/cooldown or the slot is empty.
+* enable number - Returns 1 or 0. 1 if the inventory item is capable of having a cooldown, 0 if not.
+
+### Example Usage
+Here's an example of how to use the `AdvanceTime` method to create an animated NPC that moves and changes its appearance:
+
+```typescript
+function checkItemCooldown(unit: WoWAPI.UnitId, slotId: WoWAPI.InvSlotId): void {
+  const [start, duration, isEnabled] = GetInventoryItemCooldown(unit, slotId);
+}
+
+checkItemCooldown('player', 1);
+```
+