net-im/py-smpplib: add new port

SMPPLib implements the Short Message Peer-to-Peer (SMPP) protocol for
exchanging SMS messages with SMSC gateways. It binds as a transmitter,
receiver or transceiver, sends and receives PDUs, and splits long or
Unicode text into concatenated multipart messages.

SMPPLib is a missing optional RUN_DEP for py-apprise

PR: 298657