Convert the Columns block to WYSIWYG.
Tasks:
- Evaluate the possibilities of adding columns in the editor side (see screenshots in the doc)
- Turn the LayoutSelector into "block styles"
More details:
https://docs.google.com/document/d/1RB4mOYWzUZM7uWYcyllfSdIGCQat4n04nrsFXLGIPBE/edit#heading=h.45wa283zrn29
This one probably requires a bit more of refinement and UX review.
- has to be done before
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PLANET-6031 Add JS acceptance tests for Columns block
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- has to be finished together with
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- is blocked by
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PLANET-5117 Investigate native "Column" block to replace our own Columns block
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