Feature suggestion: Test_Name_Case (or some other name)

[CalvinQuark]

Thank you for this very useful extension!

It would be helpful if this extension included a transformation for generating Pascal case separated by underscores:

E.g., CalculatorShouldCalculateCorrectOutputs --> Calculator_Should_Calculate_Correct_Outputs

I'm not sure what this proposed casing should be called. But here are a couple of ideas: Change Case test-name or Change Case Pascal-snake