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/c-api.h

@@ -451,6 +451,10 @@ SHERPA_ONNX_API typedef struct SherpaOnnxOfflineDolphinModelConfig {
   const char *model;
 } SherpaOnnxOfflineDolphinModelConfig;
 
+SHERPA_ONNX_API typedef struct SherpaOnnxOfflineZipformerCtcModelConfig {
+  const char *model;
+} SherpaOnnxOfflineZipformerCtcModelConfig;
+
 SHERPA_ONNX_API typedef struct SherpaOnnxOfflineModelConfig {
   SherpaOnnxOfflineTransducerModelConfig transducer;
   SherpaOnnxOfflineParaformerModelConfig paraformer;
@@ -474,6 +478,7 @@ SHERPA_ONNX_API typedef struct SherpaOnnxOfflineModelConfig {
   SherpaOnnxOfflineMoonshineModelConfig moonshine;
   SherpaOnnxOfflineFireRedAsrModelConfig fire_red_asr;
   SherpaOnnxOfflineDolphinModelConfig dolphin;
+  SherpaOnnxOfflineZipformerCtcModelConfig zipformer_ctc;
 } SherpaOnnxOfflineModelConfig;
 
 SHERPA_ONNX_API typedef struct SherpaOnnxOfflineRecognizerConfig {