ADD: DDGNode in FileRepository to connect to DataFileNames

[marques-bruno]

@damienmarchal, ma POC marche plutôt bien.. on garde?

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This PR:

• [ ] builds with SUCCESS for all platforms on the CI.
• [ ] does not generate new warnings.
• [ ] does not generate new unit test failures.
• [ ] does not generate new scene test failures.
• [ ] does not break API compatibility.
• [ ] is more than 1 week old (or has fast-merge label).

Reviewers will merge only if all these checks are true.

[marques-bruno]

seems outdated... Closing