refactor: manage upscaler params through model manager (#1645)

src/upscaler.h

@@ -4,6 +4,7 @@
 #include "core/ggml_extend_backend.h"
 #include "core/tensor.hpp"
 #include "model/upscaler/esrgan.hpp"
+#include "model_manager.h"
 #include "stable-diffusion.h"
 
 #include <memory>
@@ -11,6 +12,7 @@
 
 struct UpscalerGGML {
     SDBackendManager backend_manager;
+    std::shared_ptr<ModelManager> model_manager;
     ggml_type model_data_type = GGML_TYPE_F16;
     std::shared_ptr<ESRGAN> esrgan_upscaler;
     std::string esrgan_path;
@@ -27,6 +29,7 @@ struct UpscalerGGML {
                  int tile_size                   = 128,
                  std::string backend_spec        = "",
                  std::string params_backend_spec = "");
+    ~UpscalerGGML();
 
     bool load_from_file(const std::string& esrgan_path,
                         bool offload_params_to_cpu,