fix: Wrong resulting data length that sending after extra BasePacketLayer modification

[am1goo]

Description:
If any extra BasePacketLayer is in use and it change the resulting size of packet (in bytes) like "packet padding" technique, the final value of data length still equals packet.Size before any modifications.
Here the existing code of SendBroadcast method:

broadcastSuccess = _udpSocketv4.SendTo(packet.RawData, 0, packet.Size, SocketFlags.None, new IPEndPoint(IPAddress.Broadcast, port)) > 0;

if (_udpSocketv6 != null)
{
    multicastSuccess = _udpSocketv6.SendTo(packet.RawData, 0, packet.Size, SocketFlags.None, new IPEndPoint(MulticastAddressV6, port)) > 0;
}

Expected behavior:
The resulting size of data to send must equals the calculated data length from extra BasePacketLayer.
Here what it should be:

extraPacketLayer.ProcessOutBoundPacket(ref emptyEp, ref packet.RawData, ref checksumComputeStart, ref packetSize);

broadcastSuccess = _udpSocketv4.SendTo(packet.RawData, 0, packetSize, SocketFlags.None, new IPEndPoint(IPAddress.Broadcast, port)) > 0;

if (_udpSocketv6 != null)
{
    multicastSuccess = _udpSocketv6.SendTo(packet.RawData, 0, packetSize, SocketFlags.None, new IPEndPoint(MulticastAddressV6, port)) > 0;
}

More info at: #1063