add gvl data category mapping and functions

[adamsachs]

Description Of Changes

We've been using a GVL data category <--> fideslang data category mapping in our compass data generation scripts. it's time to move this mapping definition/function to fideslang.

Change here is purely additive and should be low-impact, so even if we need to tweak, shouldn't disrupt any other utilities 👍

Code Changes

• add GVL <--> fideslang data category mapping file
• add and expose associated mapping functions

Steps to Confirm

• list any manual steps taken to confirm the changes

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation Updated
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

[pattisdr]

Wonderful to see this moving to fideslang - mostly I have some comments about whether we want to make some slight edits to the raw text from the vendor list, but we can also match it too. Just pointing it out.