Memory only databases option (stats , queries etc)

### 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

Adguard is writing a ton of queries to disk and this is often causes wear on SDCard with Raspberry pi.

### Proposed solution

please add a configuration setting to keep the query cache and query stats "in memory only" since you already have a max cache size option anyway this should limit memory use to whatever user wants. I am totally ok with loosing the stats on occasional reboot as opposed to having the Sdcards fail

### Alternatives considered and additional information

trying to set overlay FS on raspberrypi but this will not allow for adguard updates and uses more memory then an option to just store query data and cache in memory with a specified size limit