OPENTHREAD_CONFIG_SRP_CLIENT_SWITCH_SERVER_ON_FAILURE macro

@def OPENTHREAD_CONFIG_SRP_CLIENT_SWITCH_SERVER_ON_FAILURE Define to 1 to enable SRP client to switch server on failure (when auto-start feature is used). This config is only used when `OPENTHREAD_CONFIG_SRP_CLIENT_AUTO_START_API_ENABLE` is enabled. When enabled, the client will try to select the next server from entries in Thread Network Data when the current server rejects an SRP update or there is no response (timeout waiting for response from server).