Refactor NVS and WiFi handlers for improved memory management and logging

- Updated KVStorageHandler interface to use std::string instead of char* for key-value operations.
- Enhanced NVSStorageHandler to utilize ESP_LOG for error and info messages instead of printf.
- Refactored WifiHandler to manage WiFi credentials using JSON format for better structure and storage.
- Replaced raw pointers with std::unique_ptr in WifiHandler and NetworkHandler for automatic memory management.
- Removed unused TouchHandler and EInkTouchHandler classes to clean up the codebase.
- Adjusted CMakeLists.txt to remove unnecessary include directories.
- Updated lv_conf.h to enable FreeRTOS and gesture recognition features.

main/network/network.h

@@ -11,7 +11,7 @@ class HttpHandler;
 class NetworkHandler {
 public:
   NetworkHandler(
-    WifiHandler&& wifiHandler
+    std::unique_ptr<WifiHandler> wifiHandler
   );
   ~NetworkHandler();
 
@@ -22,6 +22,6 @@ public:
 
 
 private:
-  WifiHandler wifiHandler;
+  std::unique_ptr<WifiHandler> wifiHandler;
   bool initialized = false;
 };