internal/pipewire: implement Core::RemoveId

This is emitted by the server when a proxy id is removed for any reason. Currently, the only path for this to be emitted is when a global object is destroyed while some proxy is still bound to it.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/pipewire.go

@@ -420,6 +420,9 @@ type eventProxy interface {
 	consume(opcode byte, files []int, unmarshal func(v any)) error
 	// setBoundProps stores a [CoreBoundProps] event received from the server.
 	setBoundProps(event *CoreBoundProps) error
+	// remove is called when the proxy is removed for any reason, usually from
+	// being targeted by a [PW_CORE_EVENT_REMOVE_ID] event.
+	remove() error
 
 	// Stringer returns the PipeWire interface name.
 	fmt.Stringer