Expose the max_end_silence_time to the user (#1532)

BOBOTANG

2024-03-22 a6a9d29bbda05fce915957e58e87c9bfd4a22730

 runtime/html5/static/wsconnecter.js

@@ -71,6 +71,7 @@
         "wav_name":  "h5",

         "is_speaking":  true,

         "chunk_interval":10,

         "itn":getUseITN(),

         "mode":getAsrMode(),

         

      };