Add skipDuringIncrementalBuild option to enhance goal

[reckart]

Is your feature request related to a problem? Please describe.
The enhance goal makes modifications to the generated class files. In the best case, this triggers a second incremental build in which the class files are then detected as already processed. However, in the worst case (and for yet unknown reasons) it could lead to an endless build - possibly because the respective class files are regenerated as part of the second build causing the enhancements to be removed.

Describe the solution you'd like
An option to disable the goal during incremental builds in cases where it is problematic would be helpful.

Describe alternatives you've considered

• Generally disable the goal for incremental builds.

Additional context
Would help with #227