Feature/add total revoked counter

[Gentleslyl2006]

Add total revoked counter and revoke_wrap query

Context:
Operators need a simple on-chain metric for how many records were revoked.

What changed:

• Added DataKey::TotalRevoked to storage_types.rs
• Added ContractError::WrapNotFound to errors.rs
• Implemented admin::revoke_wrap in admin.rs
  • requires admin auth
  • removes the wrap record
  • decrements the user’s WrapCount
  • increments global TotalRevoked
  • emits a revoke event
• Added revoke_wrap and total_revoked contract methods in lib.rs
• Added queries::total_revoked in queries.rs
• Added tests in test.rs for:
  • successful revoke increments global revoked counter
  • revoked wrap is removed and user balance updates
  • revoke of nonexistent wrap fails with WrapNotFound

Notes:

• total_revoked is stored in instance storage
• counter increments only on successful revocation
• Closes feature: Add total revoked counter #283

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