Add "Top Clients (blocked)" table

[DL6ER]

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• I have made only one major change in my proposed changes.
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What does this PR aim to accomplish?:

Add a fourth table listing the number of blocked queries per client:

Note that this is a feature request from Discourse.

How does this PR accomplish the above?:

• Add new API endpoint api.php?topClientsBlocked
• Add new table to dashboard
• Extend existing "Top Clients" table JS code to also treat the new table (we get both datasets in one query). This is duplicating the functionality we already have for the other two tables (Top Domains/Top Ads) which basically follow the same logic.

What documentation changes (if any) are needed to support this PR?:

None

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/top-blocked-domains-per-client/5055/6

[PromoFaux]

This doesn't appear to be working for me... Do I need to the relevant version of FTL time to propogate the block counter?

Never mind, pihole-FTL process got stuck somehow on my pi. Could not stop or restart it. Reboot of pi sorted that out and now the tables look right:

Approved pending merge of pi-hole/FTL#275