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currently we have queryCellInfo, pdfQueryCellInfo and excelQueryCelInfo events in grid. which is triggered before the cell rendered.
here we can customize the cell value and styles etc.
we need to provide the same support for aggregate cell. so we can customize aggregate cell using its args while on grid rendering, pdfExporting and excelExporting.
also pass the aggeregate template type in the event args ( footerTemplate / groupCaptionTemplate / groupFooterTemplate