Add to npm package

[jtasse]

Background

I am looking into modernizing my current Google Apps Scripts (GAS), within which I currently use SheetConverter. However, as this guide points out, local scripts will not "know about" referenced "Libraries" (as the GAS docs refer to them) unless they are wired up via a corresponding type/npm package.

Request

Make SheetConverter available available as an npm package so that modern GAS implementations can import them.

Workaround

Per the GAS + typescript docs, you can simply ignore reference errors in local code with a ts-ignore statement. I will probably do this for now, but eventually I would like to implement a true package reference for SheetConverter so that I can run tests at its boundaries.