Ensure PR title matches conventional commits spec

### 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
](https://www.conventionalcommits.org/en/v1.0.0/) 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](https://github.com/marketplace/actions/semantic-pull-request), it seems to be made for this job specifically