Add server-side chunking.
As azy cant know the size of the chunked data, your app will have to free the Azy_Net structure by itself, after
sending a final NULL data.
If current Azy_Net for Azy_Server_Client was NULL, azy_server_module_send() will replace it by given Azy_Net.
We have to nullify it again to avoid any possible bug due to this trick.