internal/pipewire: implement Core::Done

The message in the sample does not correspond to any known method call. The spec does not mention what to do with messages like this, but all existing usage code simply drops it.

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

internal/pipewire/core.go

@@ -108,6 +108,20 @@ func (c *CoreInfo) MarshalBinary() ([]byte, error) { return Marshal(c) }
 // UnmarshalBinary satisfies [encoding.BinaryUnmarshaler] via [Unmarshal].
 func (c *CoreInfo) UnmarshalBinary(data []byte) error { return Unmarshal(data, c) }
 
+// The CoreDone event is emitted as a result of a client Sync method.
+type CoreDone struct {
+	// Passed from [CoreSync.ID].
+	ID Int
+	// Passed from [CoreSync.Sequence].
+	Sequence Int
+}
+
+// MarshalBinary satisfies [encoding.BinaryMarshaler] via [Marshal].
+func (c *CoreDone) MarshalBinary() ([]byte, error) { return Marshal(c) }
+
+// UnmarshalBinary satisfies [encoding.BinaryUnmarshaler] via [Unmarshal].
+func (c *CoreDone) UnmarshalBinary(data []byte) error { return Unmarshal(data, c) }
+
 // The CoreBoundProps event is emitted when a local object ID is bound to a global ID.
 // It is emitted before the global becomes visible in the registry.
 type CoreBoundProps struct {