[Feature]: add more FF classifications

[FernandoRDLL]

Feature Description

Add more FF classification modes and clean code

Use Case / Motivation

The code is very hard to maintain

Academic / Industry Justification (if applicable)

No response

Proposed Implementation (Optional)

No response

Willingness to Contribute

Yes, I can implement this myself and submit a PR

Alternatives Considered

No response

Additional Context

No response

Pre-submission Checklist

• I have searched existing issues to ensure this feature has not already been requested
• I have read the documentation to confirm this feature does not already exist

[theisij]

How is this different from issue #55? And also, I thought what we agreed there was to limit the ff classification to only ff49, and instead create a backfilled GICS industry code?