refactor: migrate SelectedBlock to BlockRange

[lawvs]

• Add new type BlockRange. It is designed for consistency between the native range and the block selection.

export type BlockRange = {
  startModel: BaseBlockModel;
  endModel: BaseBlockModel;
  startOffset: number;
  endOffset: number;
  /**
   * Models between startModel and endModel, not including startModel and endModel
   */
  betweenModels: BaseBlockModel[];
  // startModel === endModel && startOffset === endOffset
  // collapsed: true;
};

• Sunset SelectedBlock from the block package
• Upstream of feat: show formatbar on block selection #1190

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