Ensure PR title matches conventional commits spec

[martimalek]

Describe the feature you'd like

It would be useful to have a way to enforce our PR titles to follow the conventional commits specification since the merge commit defaults to the PR title (can be manually edited though).

This would help us avoid mistakes when merging a PR that ends up not triggering a new release of the library (since semantic-release uses the merge commit to understand which kind of change we are introducing and which type of release it needs to make).

We can try the semantic-pull-request action, it seems to be made for this job specifically

[martimalek]

Related to #418