Support streaming conformer CTC models from wenet (#427)

sherpa-onnx/csrc/online-model-config.cc

@@ -13,6 +13,7 @@ namespace sherpa_onnx {
 void OnlineModelConfig::Register(ParseOptions *po) {
   transducer.Register(po);
   paraformer.Register(po);
+  wenet_ctc.Register(po);
 
   po->Register("tokens", &tokens, "Path to tokens.txt");
 
@@ -46,6 +47,10 @@ bool OnlineModelConfig::Validate() const {
     return paraformer.Validate();
   }
 
+  if (!wenet_ctc.model.empty()) {
+    return wenet_ctc.Validate();
+  }
+
   return transducer.Validate();
 }
 
@@ -55,6 +60,7 @@ std::string OnlineModelConfig::ToString() const {
   os << "OnlineModelConfig(";
   os << "transducer=" << transducer.ToString() << ", ";
   os << "paraformer=" << paraformer.ToString() << ", ";
+  os << "wenet_ctc=" << wenet_ctc.ToString() << ", ";
   os << "tokens=\"" << tokens << "\", ";
   os << "num_threads=" << num_threads << ", ";
   os << "debug=" << (debug ? "True" : "False") << ", ";