Remove unit_params_range from generate.py

[JoeZiminski]

closes #3077 by removing the unused unit_params_range in generate.py. This previously allowed the user to set the parameters for templates injected into synthetic recordings. However I think it was superceeded by unit_params. @samuelgarcia you were correct on #3077 unit_params can take a tuple in which case it will use these as bounds to generate template parameters randomly. So unit_params performs the job of unit_params_range.

[zm711]

Any chance this needs a deprecation? Or is this new enough that it can just be deleted without annoying users?

[JoeZiminski]

Good question, my impression is it is quite new and it is not widely used. Also, it was not connected to anything so if was used it wasn't doing anything. As such, I think either remove or raise an error if trying to use saying it doesn't do anything, use unit_params instead, and remove version after next. Happy with both approaches 🤔

[samuelgarcia]

Merci Joe
I am agree that we could remove this without warning it was somhow a hidden option that nobody used.