Summary of valid domains among all the block lists

[lordraiden]

It would be nice to have a summary of how many domains are valid among all the block lists added to adguard. So repeated, invalid, etc. are not considered.
Somehow like pihole does

[ghost]

Duplicate of #400 (comment) #1364

how many domains are valid among all the block lists added to adguard. So repeated, invalid, etc. are not considered.

#1450 (only for local lists).

[ameshkov]

Marked as dup.

We'll try to take it into account when we'll be redesigning filters settings (which is necessary to implement #1325 )