Add Surefire plugin

[see-quick]

This PR adds a surefire plugin to run UTs within the test container.

[scholzj]

So, in all other projects we run the unit and integration tests with one step. Not sure if there is any reason to do it separately. If there is some reason for it and you want to keep it separate, its fine with me.

[see-quick]

So, in all other projects we run the unit and integration tests with one step. Not sure if there is any reason to do it separately. If there is some reason for it and you want to keep it separate, its fine with me.

Hmmm, I wanted to do it simultaneously but now that I have mutation testing included I want to first check:

1. Unit tests (if that works move to the next point)
2. Mutation tests where I check coverage (i.e., mutation and line coverage) from Unit tests (if someone didn't cover a feature with Unit tests mutation/line coverage would fail otherwise one can provide to the next point)
3. Run integration tests

[scholzj]

Ok. As I said, if it has some reason, it is fine with with me.