Upgrade CKEditor & support Markdown input

Hello! I just tried H5P for the first time (spefically converting a Carpentries-style challange into a single-choice question). The editor was unfortunately missing formatting options for code / monospace. Since CKEditor 5 could support GFM: are you planning to upgrade to that?

Related to https://h5p.org/node/2247 & https://h5p.org/node/2444.

Upgrade to CKEditor 5
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