group_encrypt
actual fun group_encrypt(session: OlmOutboundGroupSessionPointer, plainText: ByteArray, message: ByteArray): ULong
actual fun group_encrypt(session: OlmOutboundGroupSessionPointer, plainText: ByteArray, message: ByteArray): ULong
expect fun group_encrypt(session: OlmOutboundGroupSessionPointer, plainText: ByteArray, message: ByteArray): ULong