feat: Enhance HttpHandler to manage response data dynamically and improve memory handling

main/network/http_handler.h

@@ -41,6 +41,7 @@ public:
 
   // only NetworkHandler can create HttpHandler instances
   friend class NetworkHandler;
+  friend esp_err_t http_event_handler(esp_http_client_event_t *evt);
   // disable copy constructor and assignment operator
   HttpHandler(const HttpHandler&) = delete;
   HttpHandler& operator=(const HttpHandler&) = delete;
@@ -52,4 +53,6 @@ private:
   esp_http_client_handle_t client;
   // backreference to WifiHandler to ensure WiFi is connected, DO NOT DELETE
   WifiHandler* wifiHandler;
+  char* response_buffer;
+  size_t response_size;
 };