feat(console): Console for runtime network interface configuration and monitoring

components/console_cmd_ifconfig/README.md

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+# Console command ifconfig
+The component offers a console with a command that enables runtime network interface configuration and monitoring for any example project.
+
+## API
+
+### Steps to enable console in an example code:
+1. Add this component to your project using ```idf.py add-dependency``` command.
+2. In the main file of the example, add the following line:
+    ```c
+    #include "console_ifconfig.h"
+    ```
+3. Ensure esp-netif and NVS flash is initialized and default event loop is created in your app_main():
+    ```c
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_err_t ret = nvs_flash_init();   //Initialize NVS
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    ```
+4. In your app_main() function, add the following line as the last line:
+    ```c
+    ESP_ERROR_CHECK(console_cmd_init());     // Initialize console
+
+    // Register all plugin command added to your project
+    ESP_ERROR_CHECK(console_cmd_all_register());
+
+    // To register only ifconfig command skip calling console_cmd_all_register()
+    ESP_ERROR_CHECK(console_cmd_ifconfig_register());
+
+    ESP_ERROR_CHECK(console_cmd_start());    // Start console
+    ```
+
+### Adding a plugin command or component:
+To add a plugin command or any component from IDF component manager into your project, simply include an entry within the `idf_component.yml` file.
+
+For more details refer [IDF Component Manager](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html)
+
+
+## Suported command:
+
+### Ifconfig:
+```
+ ifconfig help: Prints the help text for all ifconfig commands
+ ifconfig netif create/destroy <ethernet handle id>/<iface>: Create or destroy a network interface with the specified ethernet handle or interface name
+ ifconfig eth init/deinit/show: Initialize, deinitialize and display a list of available ethernet handle
+ ifconfig: Display a list of all esp_netif interfaces along with their information
+ ifconfig <iface>: Provide the details of the named interface
+ ifconfig <iface> default: Set the specified interface as the default interface
+ ifconfig <iface> ip6: Enable IPv6 on the specified interface
+ ifconfig <iface> up: Enable the specified interface
+ ifconfig <iface> down: Disable the specified interface
+ ifconfig <iface> link <up/down>: Enable or disable the link of the specified interface
+ ifconfig <iface> napt <enable/disable>: Enable or disable NAPT on the specified interface.
+ ifconfig <iface> ip <ipv4 addr>: Set the IPv4 address of the specified interface
+ ifconfig <iface> mask <ipv4 addr>: Set the subnet mask of the specified interface
+ ifconfig <iface> gw <ipv4 addr>: Set the default gateway of the specified interface
+ ifconfig <iface> staticip: Enables static ip
+ ifconfig <iface> dhcp server <enable/disable>: Enable or disable the DHCP server.(Note: DHCP server is not supported yet)
+ ifconfig <iface> dhcp client <enable/disable>: Enable or disable the DHCP client.
+Note: Disabling the DHCP server and client enables the use of static IP configuration.
+```