Verify what must be exported by DLL packages to use imports by the ckeditor5 package everywhere

[pomek]

A follow-up: #10375 (comment).

Currently, if a DLL package imports something from another DLL package, the import statement must use the full name of the imported package.

We suggest importing using the ckeditor5 package. It isn't consistent with other imports. It would be good to unify it across the entire project.

Let's find what must be exported by DLL packages.

[CKEditorBot]

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[CKEditorBot]

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