[FEATURE REQUEST]: Support for unit testing using `Show()` in Dataframe

**Is your feature request related to a problem? Please describe.**
When we write unit test and set breakpoints, one cannot debug the DataFrame in Quick Watch window because the `Console.WriteLine` will not work. Hence, having trouble doing Test Driven Development and quick prototyping.

**Describe the solution you'd like**
Could you add/replace/support `Console.WriteLine` in `Microsoft.Spark.Sql.DataFrame.Show()` to `System.Diagnostics.Debug.WriteLine` so it works in the immediate window. Then I can write `df.Show()` in the code or in the Quick Watch and it will work.

**Describe alternatives you've considered**
I have to use `Collect()` which is difficult to interpret and hangs in the Quick Watch

**Additional context**
Add any other context or screenshots about the feature request here.