Idea: consider adding ECS extension support

[ameshkov]

Here's the thread that gave me this idea:
AdguardTeam/dnsproxy#7

If /32 (IPv4) or /128 (IPv6) address is specified in the ECS extension, we might want to use it instead of client address in the query log and stats modules.

In this case, we will be able to chain DNS queries keeping information about the actual client. For instance, from a local AdGuard Home or dnsproxy to a remote AdGuard Home instance located on a VPS.

[szolin]

implemented? @ameshkov

[ameshkov]

@szolin not really. The point of this feature request is to use ECS to identify clients.

[ameshkov]

Dup of #1727