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

sherpa-onnx/c-api/cxx-api.h

@@ -241,6 +241,10 @@ struct SHERPA_ONNX_API OfflineDolphinModelConfig {
   std::string model;
 };
 
+struct SHERPA_ONNX_API OfflineZipformerCtcModelConfig {
+  std::string model;
+};
+
 struct SHERPA_ONNX_API OfflineMoonshineModelConfig {
   std::string preprocessor;
   std::string encoder;
@@ -267,6 +271,7 @@ struct SHERPA_ONNX_API OfflineModelConfig {
   OfflineMoonshineModelConfig moonshine;
   OfflineFireRedAsrModelConfig fire_red_asr;
   OfflineDolphinModelConfig dolphin;
+  OfflineZipformerCtcModelConfig zipformer_ctc;
 };
 
 struct SHERPA_ONNX_API OfflineLMConfig {