Represents the command used to resize the column on a worksheet.
* The command has a boolean field canUndo that indicates whether the command supports undo and redo operations, and an execute method that performs an execute or undo operation.
* The arguments of the execute method are as follows.
context {GC.Spread.Sheets.Workbook} The context of the operation.
options {Object} The options of the operation.
* options.sheetName {string} The sheet name.
* options.columns {Array} The resize columns; each item is an object which has firstCol and lastCol.
* options.size {number} The size of the column that is being resized.
* options.rowHeader {boolean} Whether the column being resized is in the row header area.
isUndo {boolean} true if this is an undo operation; otherwise, false.