PIM-3136 : added sequential edition backend storage entity

| Q                    | A
| -------------------- | ---
| Bug fix?             | No
| New feature?         | Yes
| BC breaks?           | No
| CI currently passes? | Yes
| Tests pass?          | Yes
| Scenarios pass?      | Yes
| Checkstyle issues?*  | Yes
| PMD issues?**        | Yes
| Changelog updated?   | No
| Fixed tickets        | 3136
| Doc PR               | No
Remove useless spaces and add a blank line at the end of the file