Suggest adding PCDN domain name statistics

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

Currently, some web pages or apps are secretly using PCDN or MCDN to occupy upload traffic without the user's knowledge
Pcdn domain name reference:
k0u3dyaay65y22zw240ex96cx6400xd04xx22z.*.*.com
k0u3dyaay65y13zw240ex96cx6400xd04xx13.*.*.com
k0u3dyaay65yazw240ex96cx6400xd04xxaz.*.*.com
9489aa-2064000902.*.*.com
690a85-1863617715.*.*.com
9489aa-2064000902.*.*.com
0286108bee788d46452cd6b43649e906.*.*.net
b74a536ddcc55b1824ba318dcbda7763.*.*.net
8f89e0e9c0a001f732a7f048c9d8dba1.*.*.net

### Proposed solution

I hope to create a domain name statistics that includes subdomains with a length greater than a certain length, or domains with extremely high similarity to the smallest level domain, or domains that have been added to the current domain name statistics department for the past 3 or 7 days to quickly view and filter out normal domains. Or add subdomain length statistics and ranking in the previous statistics, as PCDN subdomains are generally longer. This facilitates the investigation of whether it is a malicious PCDN upload. Cannot be directly blocked, as some normal PCDNs have also been mistakenly disabled during use.

### Alternatives considered and additional information

_No response_