Inconsistency in `model/Attribute.java`

[YKraml]

The Attribute.java class has a method public String getType().
This method only returns the types number, boolean and string.
The cases Map, List and Constraint are missing in the if else block.

[SundermannC]

Hi @YKraml,
thanks a lot for your report and apologies for the late response. I do not see a reason why those should be missing and agree this should be fixed.

[MiriamGaus]

In PR #15, this is fadjusted to go along with the definition in this paper https://doi.org/10.1016/j.jss.2024.112326

Therefore, Map, List, and Constraint are not added, but ´AttributeList´ is added. The ´Number´ is not divided into ´Integer´ and ´Float´,