CryptoOnramp SDK: EU Updates to Identifier Requirements

[Twigz]

Summary

• Updates EU support, specifically around identifier requirements and submission. From the doc linked below in the Motivation section:

  We need to decouple the CARF/CRS TIN (Tax Identification Number) requirement from the
  user's nationality and country of residence.

• Updates the valid backend field to completed.
• Adds identifiers missing from our internal list that are present in the linked doc.

Motivation

https://docs.google.com/document/d/1TGHh_Yyb8k--TO8iE2L9mFO_L3n65FBwShtrBrSDdTo/edit?tab=t.0#heading=h.ma5l4p2p3zrs

Testing

• Added tests
• Modified tests
• Manually verified

Used the example app to test out the new changes, including:

1. Showing the expandable list of CARF entry fields, including deletion/addition.
2. Ensuring the missing identifier requirements were still captured and displayed upon submission.
3. Filling in CARF ids that also satisfy MiCA requirements.