feat(esp_netif): add support for DHCP Option 114 captive portal URI

DHCP Option 114 provides a modern method of indicating a captive
portal redirect to DHCP client. This introduces Option 114 to
the DHCPS component as well as provides examples for usage.

components/lwip/include/apps/dhcpserver/dhcpserver_options.h

@@ -1,16 +1,8 @@
-// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/*
+ * SPDX-FileCopyrightText: 2017-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #pragma once
 
 #ifdef __cplusplus
@@ -129,6 +121,7 @@ typedef enum
     CLIENT_LAST_TRANSACTION_TIME = 91,
     ASSOCIATED_IP = 92,
     USER_AUTHENTICATION_PROTOCOL = 98,
+    CAPTIVEPORTAL_URI = 114,
     AUTO_CONFIGURE = 116,
     NAME_SERVICE_SEARCH = 117,
     SUBNET_SELECTION = 118,