internal/pipewire: implement Client::Info

Everything is already supported, as usual.

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

internal/pipewire/header_test.go

@@ -47,6 +47,12 @@ func TestHeader(t *testing.T) {
 			Size:   0x198, Sequence: 1, FileCount: 0,
 		}, nil},
 
+		{"PW_CLIENT_EVENT_INFO", []byte(recvmsg00Message02Header), pipewire.Header{
+			ID:     pipewire.PW_ID_CLIENT,
+			Opcode: pipewire.PW_CLIENT_EVENT_INFO,
+			Size:   0x1f0, Sequence: 2, FileCount: 0,
+		}, nil},
+
 		{"PW_SECURITY_CONTEXT_METHOD_CREATE", []byte{
 			// Id
 			3, 0, 0, 0,