Adding/removing protected ranges

[wthueb]

I see that the function is defined but it's not implemented yet: https://github.com/theoephraim/node-google-spreadsheet/blob/main/src/lib/GoogleSpreadsheetWorksheet.ts#L874

That's fine and I guess it'll be added in the future, but is there a way to still do this on a sort of lower level? Current plan is to just use google.sheets from googleapis, but mixing the two libraries feels bad in a way.