[INFRA] Automate the generation of the GitHub release draft

[tbouffard]

The creation of the release in the repository is currently fully manual.
It is described in https://github.com/process-analytics/bpmn-visualization-js/blob/v0.42.0/docs/contributors/maintainers.md#mark-the-bpmn-visualization-examples-repository-as-released

We could introduce a workflow that we could manually run. By passing the version value, we could generate a draft release with all information.
Maintainers would only have to review and clean the notes prior publishing the release.

Several actions exist to manage this. I have already used https://github.com/ncipollo/release-action.
We could do something like in https://github.com/bonitasoft/bonita-documentation-theme/blob/v1.11.0/.github/workflows/create-release.yml

As usual, prior implementing the workflow, don't forget to test it in https://github.com/process-analytics/github-actions-playground/

Tasks

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1. Test an implementation in the playground repository. ci: add wf to create GH release for the examples repo github-actions-playground#311 (comment)
2. Implementation in this repository ci: add a workflow to create the GitHub release #584
3. Update the release documentation in the bpmn-visualization repository to run the new workflow (provide a direct link) and keep the manual procedure as a backup. See docs: simplify the release in the examples repository bpmn-visualization-js#3011