Cached queries on dashboard

### 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

136 / 5.000
The dashboard does not display cached queries.

### Proposed solution

It would be very useful to see the percentage of cached DNS servers that users are querying in dashborard. Could you please take this into account for future updates?

### Alternatives considered and additional information

_No response_