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refactor: [WIP] convert slices from CRTP to C++20 concepts
Description
Convert slices from CRTP to C++20 concepts
Checklist
- [x] The title and commit message(s) are descriptive.
- [x] Small commits made to fix your PR have been squashed to avoid history pollution.
- [x] Tests have been added for new features or bug fixes.
- [x] API of new functions and classes are documented.
It seems that some conversions are still missing. This PR needs a little more work before it can be reviewed and merged.