Enhance log filtering and testing functions

[Sakura-Luna]

Prerequisites

• I have checked the Wiki and Discussions and found no answer

• I have searched other issues and found no duplicates

• I want to request a feature or enhancement and not ask a question

The problem

I would like several aspects to be optimized:

1. Cache the PTR data of the client and refresh it regularly to avoid disappearing after each restart
2. Coexist upstream_dns and upstream_dns_file, which allows users to store general and specific settings respectively
3. Logs can be filtered according to the queried DNS Server
4. Add detailed feedback for upstream DNS tests, such as the latency of each query

Proposed solution

Nothing

Alternatives considered and additional information

No response

[github-actions]

Potential duplicates:

• [Query log filtering by filter ID #6032] Query log filtering by filter ID (60.63%)

[Sakura-Luna]

Potential duplicates:

• [Query log filtering by filter ID #6032] Query log filtering by filter ID (60.63%)

Quite different from this.

[ainar-g]

Please do not put several feature requests into one. That makes it harder to look for duplicates.