feat: add pdf annotation support

[doouding]

There are two types of annotation, one is TextAnnotation which allows you to select text in PDF and add comments on it; the other is ClipAnnotation which is basically an image.

export type ClipAnnotation = {
  type: AnnotationType.Clip;
  comment: Y.Text;
  highlightRects: Record<number, [number, number, number, number][]>;
};

export type TextAnnotation = {
  type: AnnotationType.Text;
  comment: Y.Text;
  /**
   * hightlighted rects in each page
   *
   * Rect<page, [x, y, w, h]>
   */
  highlightRects: Record<number, [number, number, number, number][]>;

  /**
   * The highlight text
   */
  text: string;
};

type ClipAnnotation = {
  type: AnnotationType.Clip;
  highlightRect: [number, number, number, number];
};

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Name	Status	Preview	Comments	Updated (UTC)
blocksuite	❌ Failed (Inspect)			Feb 28, 2024 3:18am
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[TheChildWang]

很期待的功能，请问为啥这个PR关闭了？ 😩