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
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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