feat: implment max stack

objects/UI/inventory/equipment/equipment_slot.gd

objects/UI/inventory/hotbar/hotbar_container.tscn

objects/UI/inventory/hotbar/hotbar_slot.gd

objects/UI/inventory/hotbar/hotbar_slot.tscn

objects/UI/inventory/inventory/inventory_slot.gd

objects/resources/item/3_armor_boots.tres

objects/resources/item/3_armor_chestplate.tres

objects/resources/item/3_armor_head.tres

scripts/inventory/inventory_data_res.gd

scripts/resources/resource.gd