Support waiting for the quality gate results

[GeertvanHorrik]

See this documentation:

https://docs.sonarqube.org/latest/analysis/gitlab-cicd/

I couldn't really find a way that this is already being used. For now I will add something like this:

        ArgumentCustomization = args => args
            .Append("/d:sonar.qualitygate.wait=true")
        });

[HofmeisterAn]

Is now included in version 1.1.30 (#111).