feat: Add AsyncApprovalNotificationChannels support to Client

[developerkunal]

🔧 Changes

• Add AsyncApprovalNotificationChannels field to Client struct in management/client.go
• Auto-generate GetAsyncApprovalNotificationChannels getter method in management.gen.go
• Auto-generate test for GetAsyncApprovalNotificationChannels in management.gen_test.go

This feature allows configuring notification channels for contacting users when their approval is required.

• Valid values: "guardian-push", "email"
• Default value: ["guardian-push"]

The field is optional and can be null. To unset values, use a PATCH request with null value.

📚 References

• Related to CIBA and Risk Assessment Request (RAR) support

🔬 Testing

• Unit tests auto-generated for the new getter method
• Manual testing can verify the field is properly serialized/deserialized in Client struct

📝 Checklist

• All new/changed/fixed functionality is covered by tests (auto-generated)
• I have added documentation for all new/changed functionality (included in struct comments)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.29%. Comparing base (af40837) to head (9785341).

Additional details and impacted files

@@           Coverage Diff           @@
##               v1     #635   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files          62       62           
  Lines       12975    12980    +5     
=======================================
+ Hits        12494    12499    +5     
  Misses        363      363           
  Partials      118      118           

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