Implement Model Refactoring

<UserStory> 1949: Model Refactoring</UserStory>

UserStory #1949

<Changes>
Replaced CSV-based serialization and deserialization in the Invoice model with fixed-size SerializedRecord structures for shared memory storage.
Implemented serialize() method to convert Invoice objects into SerializedInvoice records using direct struct field assignment and strcpy_s for string fields.
Implemented deserialize() method to reconstruct Invoice objects directly from SerializedInvoice types instead of parsing CSV strings.
Updated Invoice class interfaces to use SerializedInvoice types, removing legacy CSV serialization APIs including getHeaders() function.
Added SerializedRecords.h dependency and forward declarations for SerializedInvoice structure in Invoice header.
Minor formatting adjustments in DataStore.cpp (closing brace placement).
</Changes>
<Test>
N/A

</Test>
<Review>
Sreeja Reghukumar, please review

</Review>

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.cpp

@@ -561,5 +561,4 @@ bool DataStore::unlockDataStore()
         return false;
     }
     return ReleaseMutex(m_globalMutex) != 0;
-}
-
+}