fix(engine): IsRunning returns true when it's ready

[xiaost]

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IsRunning() 方法现在只有在可以监听时，才会返回 true

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en:

• added Listener() method for network transport
• check Listener() in IsRunning()

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.32%. Comparing base (00ed124) to head (81e2ea3).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1301      +/-   ##
===========================================
+ Coverage    72.23%   72.32%   +0.08%     
===========================================
  Files          138      138              
  Lines        16139    16185      +46     
===========================================
+ Hits         11658    11705      +47     
+ Misses        3886     3885       -1     
  Partials       595      595              

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