103 Early Hints support

### 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

### Description

#### What problem are you trying to solve?
Faster page loads using server think-time with Early Hints

#### Proposed solution
103 Early Hints support:
https://developer.chrome.com/blog/early-hints/

#### Alternatives considered
HTTP/2 Server Push (deprecated)