Bluetooth device manufacturer data property

[nondebug]

The spec lists properties for an abstract "Bluetooth device" here but does not include a property for storing manufacturer data. Manufacturer data is referenced in the non-normative note explaining how requestDevice matches devices against filters (just below the Bluetooth interface definition):

To match a filter, the device has to: [...] advertise manufacturer specific data matching all of the values in manufacturerData if that member is present

To address this, the spec should add a manufacturer data property to the list of Bluetooth device properties and define steps for replacing the manufacturer data when new advertisements are received.