Exporting MakeUniversalOpts

[mmaietta]

This is to allow other packages to extract specific logic/options with typesafety

Context: Electron-Builder integrates with electron/universal and, right now, has to add a new config property whenever electron/universal changes/adds to MakeUniversalOpts. What I'd like to do is to be able to add a universal: MakeUniversalOpts object to our Mac Options such that it simply stays up to date whenever our electron/universal dep is updated

Ref: https://github.com/electron-userland/electron-builder/pull/6913#issuecomment-1146065657