Support streaming zipformer CTC (#496)

* Support streaming zipformer CTC

* test online zipformer2 CTC

* Update doc of sherpa-onnx.cc

* Add Python APIs for streaming zipformer2 ctc

* Add Python API examples for streaming zipformer2 ctc

* Swift API for streaming zipformer2 CTC

* NodeJS API for streaming zipformer2 CTC

* Kotlin API for streaming zipformer2 CTC

* Golang API for streaming zipformer2 CTC

* C# API for streaming zipformer2 CTC

* Release v1.9.6

sherpa-onnx/python/csrc/online-zipformer2-ctc-model-config.cc

@@ -0,0 +1,22 @@
+// sherpa-onnx/python/csrc/online-zipformer2-ctc-model-config.cc
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#include "sherpa-onnx/python/csrc/online-zipformer2-ctc-model-config.h"
+
+#include <string>
+#include <vector>
+
+#include "sherpa-onnx/csrc/online-zipformer2-ctc-model-config.h"
+
+namespace sherpa_onnx {
+
+void PybindOnlineZipformer2CtcModelConfig(py::module *m) {
+  using PyClass = OnlineZipformer2CtcModelConfig;
+  py::class_<PyClass>(*m, "OnlineZipformer2CtcModelConfig")
+      .def(py::init<const std::string &>(), py::arg("model"))
+      .def_readwrite("model", &PyClass::model)
+      .def("__str__", &PyClass::ToString);
+}
+
+}  // namespace sherpa_onnx