add missing requests and responses in info api

[shamis]

add support for missing requests and response from spec

• alert_notification
• broadcast_sm_resp
• cancel_broadcast_sm
• cancel_broadcast_sm_resp
• data_sm
• data_sm_resp
• generic_nack
• query_broadcast_sm
• submit_multi
• submit_multi_resp

[c-bik]

Try

smpp:pack(#{command_id => smpp:cmd(submit_multi),command_status => 0, 
sequence_number => 1, dest_address => []}).