text: Title: Add an option to remove line numbers in gr.Code
  Body: - [X ] I have searched to see if a similar issue already exists.
  
  
  **Is your feature request related to a problem? Please describe.**  
  `gr.Code()` always displays line numbers.
  
  **Describe the solution you'd like**  
  I propose to add an option `show_line_numbers = True | False` to display or hide the line numbers. The default should be `True` for compatibility with the current behaviour.
  