Avoid duplicate decision tables after importing Apps

**Is your feature request related to a problem? Please describe.**
https://forum.flowable.org/t/how-to-avoid-duplicates-when-reuse-models-attached-in-two-different-app-are-imported-in-productive-system/6995

We are frustrated to see duplicate objects decision tables when we export and import Apps from one Flowable engine to another. We see many identical decision tables with even the same key; software should not allow to create more than 1 object with the identical key:


**Describe the solution you'd like**
At import, Flowable should detect that a decision table with the same key does already exist, and provide the choice to Overwrite All, Overwrite, Skip All, Skip.

Could please someone add this feature for us in the Flowable standard?

Thanks a lot,
Joachim