Change enter behaviour by listening to enter command's beforeExecute

[Reinmar]

I know that we discussed this hundreds of times, but I finally made my decision (I'll write it down later). The list feature should extend the enter command, not only the keystroke.

This is a part of #339.

And requires https://github.com/ckeditor/ckeditor5-core/issues/22.

[Reinmar]

And there goes clarification of our decision: #340

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There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

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