Add ability to exclude certain domains from query counts


For repeated domains that are constantly being forwarded/blocked because some IoT devices are sending DNS requests every few seconds, the percentage of block queries are extreme, and obfuscates real scenarios of normal internet usage. We should be able to exclude these domains, so the numbers can better reflect how many our regular DNS requests were forwarded/blocked.

We can exclude domains in Settings, then in Dashboard, we can have two options to choose to show the filtered results, or the unfiltered results.