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

kotlin-api-examples/run.sh

@@ -253,6 +253,13 @@ function testOfflineAsr() {
     rm sherpa-onnx-zipformer-multi-zh-hans-2023-9-2.tar.bz2
   fi
 
+  if [ ! -f ./sherpa-onnx-zipformer-ctc-zh-int8-2025-07-03/model.int8.onnx ]; 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
+
   out_filename=test_offline_asr.jar
   kotlinc-jvm -include-runtime -d $out_filename \
     test_offline_asr.kt \