<!-- Describe your changes in detail -->
Hotfix for https://github.com/juspay/hyperswitch/pull/9459

Mandatorily send cvv to nexixpay card payments.
To implement this **search_filter** feature, you'll need to modify these architectural layers:


**1. External Connector Integration**
   - `crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs`

**Code Patterns Applied:**
- Extend existing types with new fields (3 changes)
{"pr_number": 9517, "pr_title": "fix(connectors): [Nexixpay] send cvv in nexixpay requests", "merged_at": "2025-09-24T05:46:03Z", "intent": {"feature_type": "search_filter", "action": "add_feature", "entities": ["customer", "payment", "merchant"]}, "hierarchy": {"connectors": ["crates/hyperswitch_connectors/src/connectors/nexixpay/transformers.rs"]}, "change_types": {"fields_added": 3}, "has_identifier_data": false, "commits_matched": 0, "match_method": "none"}