outbound_group_session_key
actual fun outbound_group_session_key(session: OlmOutboundGroupSessionPointer, key: ByteArray): ULong
actual fun outbound_group_session_key(session: OlmOutboundGroupSessionPointer, key: ByteArray): ULong
expect fun outbound_group_session_key(session: OlmOutboundGroupSessionPointer, key: ByteArray): ULong