feat(collator) add export pov on slot base collator (#7585)

Closes #7573

@skunert  @bkchr



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Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sebastian Kunert <skunert49@gmail.com>