fix(router): metadata field update in merchant_account and merchant_connector_account (#359)

Co-authored-by: Abhishek Marrivagu <abhi.codes10@gmail.com>

crates/storage_models/src/schema.rs

@@ -158,6 +158,7 @@ diesel::table! {
         publishable_key -> Nullable<Varchar>,
         storage_scheme -> MerchantStorageScheme,
         locker_id -> Nullable<Varchar>,
+        metadata -> Nullable<Jsonb>,
         routing_algorithm -> Nullable<Json>,
     }
 }