Check which XDebug modes might be helpful

[joshsedl]

https://xdebug.org/docs/all_settings

[joshsedl]

Definitely some interesting stuff there, I think using vanilla xdebug together with the code coverage mode is currently enough. Keeping this issue open for discussion.

[JPustkuchen]

@joshsedl perhaps we should just think about documenting this or linking this in our documentation instead of a technical solution... unsure...

[joshsedl]

I think besides code coverage, which is already supported, only Profiling would be interesting for our use case. I created a seperate issue for this, see: #126