don't allow send msg if the conversion session is closed (official cloud api)

problem: in official cloud api if you can only send template message if you need to start a conversion when there is no conversation session available.

how does the conversation session created?

if the customer send in a message to you, this will start the conversation session, each session last 24h.

within the 24h session, biz owner will be able to reply anything without template.

cloud api doesn't have a API to check if the conversation is still valid or not. we've to record this timing by our own.

solution: when user send in a msg, each msg that send in, we will add/reset the conversation session to 24 between the biz owner's WA connection & the number (don't go with ticket). then when we try to send any msg to this number, we will check if the session has expired or not. if yes, then we will close all the ticket's input and allow only them to choose template to send in.