New multiLocationId identifier for menus API menu entities

The menus API includes a new multiLocationId identifier for menu entities. The multiLocationId identifier is equivalent to the masterId identifier and is used to identify and consolidate menu entities that are versions of each other. The name of the new multiLocationId value is more consistent with Toast API terminology standards. The masterId value is now deprecated and will remain in the menus API for backwards compatibility. If your integration uses masterId, you should update the value name to use multiLocationId. For more information, see Understanding GUIDs, referenceIds, and multiLocationIds.