text: Title: Selecting fields dynamically based on user input
  Body: ## Problem
  
  I see that https://github.com/RobertCraigie/prisma-client-py/issues/19 added ability to select field to the client, but what is I need to select field based on user input, so the field to be selected has to be dynamic. But the above solution, needs you to regenerate the client. I wonder if there are any pattern for this scenario or any plans to address it in the future.
  