feat(payment-methods): [Proxy] add saved card flow for proxy payments (#8964)

Co-authored-by: Prasunna Soppa <prasunna.soppa@juspay.in>
Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>
Co-authored-by: Prasunna Soppa <70575890+prasunna09@users.noreply.github.com>

crates/common_enums/src/enums.rs

@@ -194,6 +194,10 @@ impl AttemptStatus {
             | Self::IntegrityFailure => false,
         }
     }
+
+    pub fn is_success(self) -> bool {
+        matches!(self, Self::Charged | Self::PartialCharged)
+    }
 }
 
 #[derive(