GitHub enhacements

[piotrooo]

@vladmihalcea what do you think about couple GitHub enhancements like:

• Add GitHub Action for run tests for each pull request. That let contributors feedback is everything OK with theirs changes.
• Add GitHub Action for generating more readable change log, and try to use a Releases. I mean use for example release-drafter. That could be connected with using labels for PR's.
• Add some tool to generate code coverage (JaCoCo and codecov)

[vladmihalcea]

I'm now working on adding support for Test Containers that will make tests run by GitHub Actions.

As for the release-drafter, that will not work properly since there are commits done without a Pull Request.

JaCoCo is also nice to have, but not a priority at the moment.

[piotrooo]

Using Pull Request can give a lot of feedback and could be treated as an additional documentation. There is any particular reason for that the commits are done without it? Maybe that could be reconsidered.

[vladmihalcea]

Around 90% of all the work was done by me, so issuing a PR that I review myself and rebase afterward would have been a waste of time.

PRs are fine for external committers, but even then, I don't always integrate them directly. Sometimes, I have to get their commit and rework it before I push the amended commit. GitHub will not view that as a merge since I'm rebasing an amended commit.

The current changelog is sufficient as this is a very small project that doesn't get a lot of changes.