Function getDefaultSortCriteria

getDefaultSortCriteria(sheetModel, selection?, orientation?): {
    headers: Map<number, string>;
    options: RangeSortOptions;
    range: CellRangeCoords;
}
Given a selection, find the 'natural' bounding area to sort.
Parameters
- sheetModel: ISheetModel
- selection: Partial<CellSelection> = null
- orientation: RangeOrientation = RangeOrientation.Rows
  When checking for header and default sort criteria this is the orientation to use.
Returns {
    headers: Map<number, string>;
    options: RangeSortOptions;
    range: CellRangeCoords;
}
- headers: Map<number, string>
- options: RangeSortOptions
- range: CellRangeCoords
Default Value
```
RangeOrientation.Rows
```