Revisit resume/end/error/expired conversation stories

Note to investigator

Find out all permutations of the resume/end/error/expired over REST API and Web Socket.

Related issues

• #118 Resume conversation after calling botConnection.end()
• #101 "Token expired" signal is not fired on Web Socket route
• #103 Generate a new token using existing conversation ID
• #94 End conversation does not really stop the polling or Web Socket
• #90 Backoff stories
  • HTTP 429/400 - we will back off
  • HTTP 404 - fatal, we will stop
• #75 End conversation does not really stop Web Socket
• #9 Resume conversation and how to renew expired token
• https://github.com/Microsoft/BotFramework-WebChat/pull/1880 Wiring up for reconnect UI

首先检查此 issue 以及相关 issue #118、#101、#103、#94、#90、#75 和 #9 中描述的 REST 和 Web Socket 行为。梳理 resume、end、error 和过期 token 的各种组合，然后在确定受影响的客户端入口点之前，定义每条路径的预期行为。