[TS] Add types to DLLs

[Witoso]

When using DLL's I want to have access to types.

Examples from the prototypes:

// image.d.ts:
import type * as image from '@ckeditor/ckeditor5-image';

declare module 'ckeditor5/build/ckeditor5-dll.js' {
	interface CKEditor5DLL {
		image: typeof image;
	}
}

// ckeditor5-dll.d.ts
import type * as clipboard from '@ckeditor/ckeditor5-clipboard';
import type * as core from '@ckeditor/ckeditor5-core';
import type * as engine from '@ckeditor/ckeditor5-engine';
import type * as enter from '@ckeditor/ckeditor5-enter';
import type * as paragraph from '@ckeditor/ckeditor5-paragraph';
import type * as selectAll from '@ckeditor/ckeditor5-select-all';
import type * as typing from '@ckeditor/ckeditor5-typing';
import type * as ui from '@ckeditor/ckeditor5-ui';
import type * as undo from '@ckeditor/ckeditor5-undo';
import type * as upload from '@ckeditor/ckeditor5-upload';
import type * as utils from '@ckeditor/ckeditor5-utils';
import type * as watchdog from '@ckeditor/ckeditor5-watchdog';
import type * as widget from '@ckeditor/ckeditor5-widget';

export interface CKEditor5DLL {
	clipboard: typeof clipboard;
	core: typeof core;
	engine: typeof engine;
	enter: typeof enter;
	paragraph: typeof paragraph;
	selectAll: typeof selectAll;
	typing: typeof typing;
	ui: typeof ui;
	undo: typeof undo;
	upload: typeof upload;
	utils: typeof utils;
	watchdog: typeof watchdog;
	widget: typeof widget;
}

declare global {
	interface Window {
		CKEditor5: CKEditor5DLL;
	}
}

[Witoso]

Decisions to make:

1. generate from some file? vs manual creation ofd.ts
2. if the manual method, where to keep them? build may not be the best place for this.
3. one file: index-dll.ts that is used during DLL build?

We need to start to check this.

[CKEditorBot]

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[CKEditorBot]

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