feat: add wifi scaner in uart.

Signed-off-by: Bo <boironic@gmail.com>

main/wifi/wifi_manager.h

@@ -44,3 +44,8 @@ esp_err_t wifi_manager_set_credentials(const char *ssid, const char *password);
  * Get the event group for WiFi state (WIFI_CONNECTED_BIT / WIFI_FAIL_BIT).
  */
 EventGroupHandle_t wifi_manager_get_event_group(void);
+
+/**
+ * Scan and print nearby APs.
+ */
+void wifi_manager_scan_and_print(void);