[F] Add pivot table func

[zurmokeeper]

🚀 Feature Proposal

A clear and concise description of what the feature is.

Add pivot table func

exceljs/exceljs#2551 exceljs/exceljs#2575 exceljs/exceljs#2578

Motivation

Please outline the motivation for the proposal.

Example

Please provide an example for how this feature would be used.

[nodegin]

is there any way to preserve pivot tables?

[zurmokeeper]

@nodegin Haha, I'm motivated to do this if anyone is interested in this feature.

[zurmokeeper]

#34

[zurmokeeper]

@nodegin 4.4.8 has been released, try it out!

[nodegin]

@zurmokeeper Wow that's really fast! Thank you so much I'll try it out!