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

.github/workflows/test-go.yaml

@@ -184,6 +184,10 @@ jobs:
           go build
           ls -lh
 
+          echo "Test Zipformer CTC"
+          ./run-zipformer-ctc.sh
+          rm -rf sherpa-onnx-zipformer-*
+
           echo "Test SenseVoice ctc"
           ./run-sense-voice-small-with-hr.sh
           ./run-sense-voice-small.sh