Save/load time to/from storage in time_manager

main/Kconfig.projbuild

@@ -30,4 +30,10 @@ menu "Bedside clock settings"
      config WIFI_MAX_RETRIES
             int "Maximum number of times to retry connecting to WiFi network"
             default 10
+     config TIME_SAVE_PERIOD_MS
+            int "How often (in ms) to save the time to persistent storage"
+            default 300000
+     config DEFAULT_TASK_STACK
+            int "Default task stack size (in words)"
+            default 4096
 endmenu