resolvers: add option for canary domain
In case browser detects canary domain it should send DNS to router instead of DOH channel defined in browser.
https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet
In case browser detects canary domain it should send DNS to router instead of DOH channel defined in browser.
https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet