Add filename option for massConvert operation

[ThePlenkov]

Hi @jung-thomas

Thanks again for a tip to use massConvert command.

One more issue I would love to add - is it possible to provide also filename as a parameter?

For example it could be useful for those who prefer to have all exported schemas in one folder.

Thank you!

[ThePlenkov]

Created PR for that. Thanks

[jung-thomas]

Thank you for the contribution. I've merged it into the Main branch. However It will probably be a day until I push the newly built version to npm. I have some other updates pending and I hope to due a big round of testing this afternoon before updating to npm.

[jung-thomas]

This feature is in the release that was just published to NPM - thanks.