Get full list of columns in check column of VerificationResult.checkResultsAsDataFrame.

**Is your feature request related to a problem? Please describe.**
Hello, is there a way to get a full list of columns in the constraint column of the checkResultsAsDataFrame dataframe? I am trying to join the VerificationResult.checkResultsAsDataFrame with VerificationResult.successMetricsAsDataFrame but it is impossible unless I can get a full list of the columns used for each constraint in checkResultsAsDataFrame. If there is a multicolumn constraint, the check value is **Stream**(column1, ?) so I can't see all the columns. This is very frustrating because I need all the values from both dataframes to give the best results on my project. I have attached a photo showing the stream example.

**Describe the solution you'd like**

The most ideal solution would be a dataframe with the all the columns from both successMetrics and checkResults. If that can't be done, if you could allow a full list of column names in the constraint column instead of stream, I think I can manipulate it to join.


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Beginne mit VerificationResult.checkResultsAsDataFrame und VerificationResult.successMetricsAsDataFrame und verfolge dann, wie Multispalten-Constraints zu Stream(column1, ?) werden. Reproduziere die DataFrame-Ausgaben aus dem Issue und ermittle, wie die vollständigen Constraint-Spalten für Joins verfügbar gemacht werden können; abgeschlossen ist die Aufgabe, wenn Multispalten-Constraints joinbare Spalteninformationen oder ein kombiniertes DataFrame bereitstellen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.