Add C++ runtime for speech enhancement GTCRN models (#1977)

See also https://github.com/Xiaobin-Rong/gtcrn

sherpa-onnx/csrc/offline-speech-denoiser-model-config.cc

@@ -0,0 +1,40 @@
+// sherpa-onnx/csrc/offline-speech-denoiser-model-config.cc
+//
+// Copyright (c)  2025  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/offline-speech-denoiser-model-config.h"
+
+#include <string>
+
+namespace sherpa_onnx {
+
+void OfflineSpeechDenoiserModelConfig::Register(ParseOptions *po) {
+  gtcrn.Register(po);
+
+  po->Register("num-threads", &num_threads,
+               "Number of threads to run the neural network");
+
+  po->Register("debug", &debug,
+               "true to print model information while loading it.");
+
+  po->Register("provider", &provider,
+               "Specify a provider to use: cpu, cuda, coreml");
+}
+
+bool OfflineSpeechDenoiserModelConfig::Validate() const {
+  return gtcrn.Validate();
+}
+
+std::string OfflineSpeechDenoiserModelConfig::ToString() const {
+  std::ostringstream os;
+
+  os << "OfflineSpeechDenoiserModelConfig(";
+  os << "gtcrn=" << gtcrn.ToString() << ", ";
+  os << "num_threads=" << num_threads << ", ";
+  os << "debug=" << (debug ? "True" : "False") << ", ";
+  os << "provider=\"" << provider << "\")";
+
+  return os.str();
+}
+
+}  // namespace sherpa_onnx