Pre-fetch commonly queried domains

[adrianmace]

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Problem Description

My house's usage pattern is predictable, but the cached domains are only valid for a certain time before they need to be fetched again from the origin. This adds time to resolve for things that we are always using. (YouTube, Plex, etc).

This is exasperated when the upstream DNS server I am querying has a high latency (due to personal preference, security benefits, etc).

Proposed Solution

I would like you to implement the feature that 0xERR0R/blocky implements whereby it pre-fetches domains that have been queried more than X times in the last Y hours so that they are always in cache.

Alternatives Considered

Additional Information

[ameshkov]

We already have a feature request about that.

However, we prefer to implement optimistic DNS instead (see #2145) which serves the same purpose.