add `middleware::logger::custom_status_replace`

[benny-n]

PR Type

Feature

PR Checklist

• [x] Tests for the changes have been added / updated.
• [x] Documentation comments have been added / updated.
• [x] A changelog entry has been made for the appropriate packages.
• [x] Format code with the latest stable rustfmt.
• [ ] (Team) Label with affected crates and semver status.

Overview

It is now possible to pass a closure to the logger, which recevies a StatusCode and returns a String for use in the log line

Closes #2627