Feat/change version to 4.0.0

[Francois-Gomis]

Reason for change

Bump version to major 4.0.0

Code changes

Change Module version composer version and changelog version

How to test

As a reviewer, you are encouraged to test the PR locally.

Checklist for authors and reviewers

Non applicable

• [ ] The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• [ ] The PR implements the changes asked in the referenced task / issue
• [ ] The automated tests are compliant with the testing strategy
• [ ] The tests are relevant, and cover the corner/error cases, not only the happy path
• [ ] You understand the impact of this PR on existing code/features
• [ ] The changes include adequate logging and Datadog traces
• [ ] Documentation is updated (API, developer documentation, ADR, Notion...)