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.cpp

@@ -4,7 +4,7 @@
 #include "common/constants.h"
 
 NetworkHandler::NetworkHandler(
-  WifiHandler&& wifiHandler
+  std::unique_ptr<WifiHandler> wifiHandler
 ) : wifiHandler(std::move(wifiHandler)) { }
 
 NetworkHandler::~NetworkHandler() { }
@@ -14,7 +14,7 @@ void NetworkHandler::init(EventGroupHandle_t system_event_group) {
     ESP_LOGW("NetworkHandler", "Already initialized, skipping");
     return;
   }
-  this->wifiHandler.init();
+  this->wifiHandler->init();
   this->initialized = true;
   xEventGroupSetBits(
     system_event_group,
@@ -23,10 +23,10 @@ void NetworkHandler::init(EventGroupHandle_t system_event_group) {
 }
 
 WifiHandler& NetworkHandler::get_wifi_handler() {
-  return this->wifiHandler;
+  return *this->wifiHandler;
 }
 
 std::unique_ptr<HttpHandler> NetworkHandler::get_http_handler(const esp_http_client_config_t&& config) {
-  return std::unique_ptr<HttpHandler>(new HttpHandler(std::move(config), &this->wifiHandler));
+  return std::unique_ptr<HttpHandler>(new HttpHandler(std::move(config), this->wifiHandler.get()));
 }