Support non-streaming zipformer CTC ASR models (#2340)

This PR adds support for non-streaming Zipformer CTC ASR models across 
multiple language bindings, WebAssembly, examples, and CI workflows.

- Introduces a new OfflineZipformerCtcModelConfig in C/C++, Python, Swift, Java, Kotlin, Go, Dart, Pascal, and C# APIs
- Updates initialization, freeing, and recognition logic to include Zipformer CTC in WASM and Node.js
- Adds example scripts and CI steps for downloading, building, and running Zipformer CTC models

Model doc is available at
https://k2-fsa.github.io/sherpa/onnx/pretrained_models/offline-ctc/icefall/zipformer.html

dotnet-examples/offline-decode-files/Program.cs

@@ -75,6 +75,9 @@ class OfflineDecodeFiles
     [Option("nemo-ctc", Required = false, HelpText = "Path to model.onnx. Used only for NeMo CTC models")]
     public string NeMoCtc { get; set; } = string.Empty;
 
+    [Option("zipformer-ctc", Required = false, HelpText = "Path to model.onnx. Used only for Zipformer CTC models")]
+    public string ZipformerCtc { get; set; } = string.Empty;
+
     [Option("dolphin-model", Required = false, Default = "", HelpText = "Path to dolphin ctc model")]
     public string DolphinModel { get; set; } = string.Empty;
 
@@ -240,6 +243,10 @@ to download pre-trained Tdnn models.
     {
       config.ModelConfig.Dolphin.Model = options.DolphinModel;
     }
+    else if (!string.IsNullOrEmpty(options.ZipformerCtc))
+    {
+      config.ModelConfig.ZipformerCtc.Model = options.ZipformerCtc;
+    }
     else if (!string.IsNullOrEmpty(options.TeleSpeechCtc))
     {
       config.ModelConfig.TeleSpeechCtc = options.TeleSpeechCtc;