fix: Add locker_id in merchant account and sbx default locker (#276)

Co-authored-by: Arun Raj M <jarnura47@gmail.com>

crates/storage_models/src/schema.rs

@@ -159,6 +159,7 @@ diesel::table! {
         parent_merchant_id -> Nullable<Varchar>,
         publishable_key -> Nullable<Varchar>,
         storage_scheme -> MerchantStorageScheme,
+        locker_id -> Nullable<Varchar>,
     }
 }