refactor: reorganize range structure

[lawvs]

• Rename getCurrentRange to getCurrentNativeRange
• Simpify BlockRange

export type BlockRange = {
  /**
   * 'Native' for native selection, 'Block' for block selection
   */
  type: 'Native' | 'Block';
  /**
   * Promise the length of models is greater than 0
   */
  models: BaseBlockModel[];
  startOffset: number;
  endOffset: number;
};

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