bluez: emit combine-stream for LE Audio device sets

Merged P V requested to merge pvir/wireplumber:bap-combine into master

For Bluetooth LE Audio device sets (e.g. pair of earbuds), bluez5-device emits "internal" nodes for each individual device, and a combine node for the device set. pipewire!1564 (merged)

Make the bluetooth monitor to create the combine nodes using module-combine-stream.

Do some shenanigans to route ObjectConfig events from bluez5-device to the correct combine node: look for combine nodes associated with device sets, and put them as managed objects of the Spa devices.

Edited by P V

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