Support streaming zipformer CTC (#496)

* Support streaming zipformer CTC

* test online zipformer2 CTC

* Update doc of sherpa-onnx.cc

* Add Python APIs for streaming zipformer2 ctc

* Add Python API examples for streaming zipformer2 ctc

* Swift API for streaming zipformer2 CTC

* NodeJS API for streaming zipformer2 CTC

* Kotlin API for streaming zipformer2 CTC

* Golang API for streaming zipformer2 CTC

* C# API for streaming zipformer2 CTC

* Release v1.9.6

scripts/dotnet/online.cs

@@ -50,6 +50,18 @@ namespace SherpaOnnx
     public string Decoder;
   }
 
+  [StructLayout(LayoutKind.Sequential)]
+  public struct OnlineZipformer2CtcModelConfig
+  {
+    public OnlineZipformer2CtcModelConfig()
+    {
+      Model = "";
+    }
+
+    [MarshalAs(UnmanagedType.LPStr)]
+    public string Model;
+  }
+
   [StructLayout(LayoutKind.Sequential)]
   public struct OnlineModelConfig
   {
@@ -57,6 +69,7 @@ namespace SherpaOnnx
     {
       Transducer = new OnlineTransducerModelConfig();
       Paraformer = new OnlineParaformerModelConfig();
+      Zipformer2Ctc = new OnlineZipformer2CtcModelConfig();
       Tokens = "";
       NumThreads = 1;
       Provider = "cpu";
@@ -66,6 +79,7 @@ namespace SherpaOnnx
 
     public OnlineTransducerModelConfig Transducer;
     public OnlineParaformerModelConfig Paraformer;
+    public OnlineZipformer2CtcModelConfig Zipformer2Ctc;
 
     [MarshalAs(UnmanagedType.LPStr)]
     public string Tokens;