DLL: Decide what to do with imports in ckeditor5-essentials

[pomek]

Provide a description of the task

After introducing the ESlint rule for our imports (#8581), the content of the packages/ckeditor5-essentials/src/essentials.js file does not pass:

ckeditor5/packages/ckeditor5-essentials/src/essentials.js

Lines 10 to 17 in ae65599

	import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
	import Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';
	import Enter from '@ckeditor/ckeditor5-enter/src/enter';
	import ShiftEnter from '@ckeditor/ckeditor5-enter/src/shiftenter';
	import SelectAll from '@ckeditor/ckeditor5-select-all/src/selectall';
	import Typing from '@ckeditor/ckeditor5-typing/src/typing';
	import Undo from '@ckeditor/ckeditor5-undo/src/undo';

⬇️ Should it be?

import { Plugin } from 'ckeditor5/src/core';

import { Clipboard } from 'ckeditor5/src/clipboard';
import { Enter, ShiftEnter } from 'ckeditor5/src/enter';
import { SelectAll } from 'ckeditor5/src/select-all';
import { Typing } from 'ckeditor5/src/typing';
import { Undo } from 'ckeditor5/src/undo';

As for now, I'll disable the new rule for the essential package.

[Reinmar]

⬇️ Should it be?

Yup. Already done.