Add heading-level property on post-accordion

[imagoiq]

Currently, we can specify heading-level property on post-accordion-item (it's not referenced in the documentation). It would be good to be able to define it on the whole post-accordion element.

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1. Add heading-level property on post-accordion
2. Document heading-level property on post-accordion on the accordion page
3. Make the heading level property required #3091
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   💔 breaking 📦 components +2
   

[imagoiq]

Depends on #2571

[gfellerph]

Discussion: release a tiny major change, make the prop required