Pim 2747

| Q                    | A
| -------------------- | ---
| Bug fix?             | No
| New feature?         | No
| BC breaks?           | No
| CI currently passes? | ?
| Tests pass?          | Yes
| Scenarios pass?      | ?
| Checkstyle issues?   | No
| Changelog updated?   | No
| Fixed tickets        | No
| Doc PR               | No


Load the products by range and save memory. 

In ORM the export time for 3957 products in now of 44s versus 1m15 before. It takes now 85m of memory versus 672m before.

In ODM the export time for 3957 products in now of 24s versus 55s before. It takes now 94m of memory versus 544m before.
Seems a serializer