Support for add-subnet option from dnsmasq (ECS/EDNS0 Client Subnet)

### Prerequisites

Please answer the following questions for yourself before submitting an issue. **YOU MAY DELETE THE PREREQUISITES SECTION.**

- [x] I am running the latest version
- [x] I checked the documentation and found no answer
- [x] I checked to make sure that this issue has not already been filed

### Problem Description
I set dnsmasq with my main DNS server on router because i need some complex `ipset` rules support, and AdguardHome is the only upsteam server. But now on AGH dashboard, i can only see the router ip but not the others real client ip.

### Proposed Solution
Add `add-mac` and `add-subnet` to dnsmasq, then AGH can get the real client ip from every requery.

### Additional Information
[Pi-hole: Support for add-subnet option from dnsmasq (ECS/EDNS0 Client Subnet)](https://discourse.pi-hole.net/t/support-for-add-subnet-option-from-dnsmasq-ecs-edns0-client-subnet/35940)