[CHORE] Setup automatic issue labelling

[jeertmans]

Labelling issues is usually something every tedious, and one can automate most of the work by simply looking at the changes files.

If you are willing to help, you can take inspiration from another repository, where I already did set up automatic issue labelling.

Ref:

• https://github.com/jeertmans/DiffeRT/blob/v0.0.18/.github/labeler.yml
• https://github.com/jeertmans/DiffeRT/blob/v0.0.18/.github/workflows/labeler.yml
• https://github.com/actions/labeler