firebase auth:import using PBKDF2_SHA512 from . net core identity 3.0

### [REQUIRED] Environment info

13.15.4

**firebase-tools:**

**Platform:**
Windows

There isn't an option to import with PBKDF2_SHA512 algo which is what modern versions of the asp.net core identity 3.0 uses to store all password hashes.

I would like to import all my users to firebase, but can't see a way around this without firebase supporting the PBKDF2_SHA512 algo.

Start at the Firebase CLI auth:import entry point and trace how imported password hashes are selected and processed. Compare the expected ASP.NET Core Identity 3.0 PBKDF2_SHA512 format with the import inputs, then verify that users using this algorithm can be imported successfully.

Written by the indexing model from the issue text.