automatically generate release notes

Since we will make gitlab releases based on git tags, we need to automatically generate release notes as well.

Release jobs examples:

• based on git tags
• pass package name to release job as env variable to include it in release as asset

Tools/doc to investigate:

• blender script to generate release notes -> need to understand what is the lts_issue python package
• blender commit convention
• mkdocstring commit convention and keep a changelog
• git-changelog used by mkdocstring
• towncrier used in CTAO template project
• Thomas repo to generate release notes

Tasks:

• test the different tools, chose a solution

A first version to test some stuff ha been designed and is available at : ReleaseNoteProject. It has been designed on a workflow based on the CI : everytime a new tag is released, a release version is generated by gitlab.

FYI @thibaut.oprinsen @paubert