OpenWRT: AdGuard Home as a dnsmasq replacement

We should provide an easy way to replace dnsmasq on openwrt:
https://openwrt.org/docs/guide-user/base-system/dhcp.dnsmasq

So we should provide an option to import the necessary configuration parameters including DHCP settings and DNS settings. Please note, that the DNS server from there will be used as a bootstrap, the real upstream will be configured in AdGuard Home settings exclusively.

Additionally, we should figure out how to keep DHCP integration in place. How does openwrt read the information about dynamic DHCP leases?