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.h

@@ -0,0 +1,39 @@
+// sherpa-onnx/csrc/offline-speech-denoiser-model-config.h
+//
+// Copyright (c)  2025  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_MODEL_CONFIG_H_
+#define SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_MODEL_CONFIG_H_
+
+#include <string>
+
+#include "sherpa-onnx/csrc/offline-speech-denoiser-gtcrn-model-config.h"
+#include "sherpa-onnx/csrc/parse-options.h"
+
+namespace sherpa_onnx {
+
+struct OfflineSpeechDenoiserModelConfig {
+  OfflineSpeechDenoiserGtcrnModelConfig gtcrn;
+
+  int32_t num_threads = 1;
+  bool debug = false;
+  std::string provider = "cpu";
+
+  OfflineSpeechDenoiserModelConfig() = default;
+
+  OfflineSpeechDenoiserModelConfig(OfflineSpeechDenoiserGtcrnModelConfig gtcrn,
+                                   int32_t num_threads, bool debug,
+                                   const std::string &provider)
+      : gtcrn(gtcrn),
+        num_threads(num_threads),
+        debug(debug),
+        provider(provider) {}
+
+  void Register(ParseOptions *po);
+  bool Validate() const;
+
+  std::string ToString() const;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_OFFLINE_SPEECH_DENOISER_MODEL_CONFIG_H_