[Feature Request] Support dns_local_addhost API.

[formulahendry]

When using DevKit to connect to IoT Edge device, we will meet with DNS resolving problem. Though we could use IP Address of the Edge device, the IP Address may change. We need to re-generate the cert, and re-setup the device connection string, when IP Address is changed. If DevKit have the dns_local_addhost API, it would be very useful. We would not have the DNS resolving problem.

See API detail here: https://os.mbed.com/users/aos/code/lwip/docs/tip/dns_8c.html

[github-actions[bot]]

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