feat(router): add delete_evidence api for disputes (#3608)

crates/router_env/src/logger/types.rs

@@ -235,6 +235,8 @@ pub enum Flow {
     CreateConfigKey,
     /// Attach Dispute Evidence flow
     AttachDisputeEvidence,
+    /// Delete Dispute Evidence flow
+    DeleteDisputeEvidence,
     /// Retrieve Dispute Evidence flow
     RetrieveDisputeEvidence,
     /// Invalidate cache flow