Support firebase/google identity platform scrypt import

Feature: Allow import from firebase authentication for seamless migration

Description: Firebase uses a modified way of scrypt, therefore the standard scrypt support auth0 offers is not sufficient. for more info: Not able to use with Crypto.scrypt in NodeJS · Issue #2 · firebase/scrypt · GitHub

Use-case: We would like to migrate from firebase to auth0. Of course rolling migration may be an option, however. An import would be the best option in our opinion to minimize the migration effort.

Thanks for creating this feedback card. Hope it gets some traction from other users!