UPDATE: Improve separation of concerns by splitting headers into own module

[mikeweltevrede]

PR Checklist

• [x] A description of the changes is added to the description of this PR.
• [ ] If there is a related issue, make sure it is linked to this PR.
• [ ] If you've fixed a bug or added code that should be tested, add tests!
• [ ] If you've added or modified a feature, documentation in docs is updated

Description of changes

Improve separation of concerns by splitting headers into own module

How have you tested this?

New and existing unit tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.0%. Comparing base (f6ad2aa) to head (b5b203e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15 +/- ## ======================================= Coverage 100.0% 100.0% ======================================= Files 1 2 +1 Lines 28 34 +6 Branches 5 5 ======================================= + Hits 28 34 +6 ```

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