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

go-api-examples/non-streaming-decode-files/main.go

@@ -28,6 +28,8 @@ func main() {
 
 	flag.StringVar(&config.ModelConfig.NemoCTC.Model, "nemo-ctc", "", "Path to the NeMo CTC model")
 
+	flag.StringVar(&config.ModelConfig.ZipformerCtc.Model, "zipformer-ctc", "", "Path to the Zipformer CTC model")
+
 	flag.StringVar(&config.ModelConfig.Dolphin.Model, "dolphin-model", "", "Path to the Dolphin CTC model")
 
 	flag.StringVar(&config.ModelConfig.FireRedAsr.Encoder, "fire-red-asr-encoder", "", "Path to the FireRedAsr encoder model")

go-api-examples/non-streaming-decode-files/run-zipformer-ctc.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [ ! -f ./sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/tokens.txt ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+
+  tar xvf sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+  rm sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03.tar.bz2
+fi
+
+go mod tidy
+go build
+
+./non-streaming-decode-files \
+  --zipformer-ctc ./sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/model.int8.onnx \
+  --tokens ./sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/tokens.txt \
+  --debug 0 \
+  ./sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/test_wavs/0.wav