Add DoubeClick Event hook in OfficeJS API

[mthrift2100]

For our development team, the single largest gap between our current COM Addin implementation and our ability to move over to the Office Addin and the OfficeJS API is the lack of the BeforeCellDoubleClick event.

With our COM Addins, this event was used to allow interactivity with reports that were generated on the worksheet. Users could double-click and as a result "Drill" into underlying data. Handling that event allowed us to build a sub-report query and display those results based on what the user clicked.

It seems like an intentional omission. Or perhaps there is a technical reason why this specific event does not work as well in the OfficeJS API.