feat: scan book to add to sell

lib/data/repositories/owner_repository.dart

@@ -33,6 +33,18 @@ class OwnerRepository {
     return result;
   }
 
+  Future<Result<Owner>> getOwnerById(int id) async {
+    if (_cachedOwners != null) {
+      final result1 = _cachedOwners!
+          .where((owner) => owner.id == id)
+          .firstOrNull;
+      if (result1 != null) {
+        return Result.ok(result1);
+      }
+    }
+    return await _apiClient.getOwnerById(id);
+  }
+
   /// Adds an [Owner] to the database, and gets the resulting [Owner].
   Future<Result<Owner>> addOwner(
     String firstName,