Make HTTP server's timeouts configurable

[ainar-g]

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

Currently, the AdGuard Home HTTP server, which server the API, has a set of hardcoded timeouts. As #7041 shows, these timeouts may be inadequate in some configurations, so they should become configurable.

Proposed solution

Make the HTTP server timeouts configurable.

Alternatives considered and additional information

No response