Support script templates for different user types/personas in the same study

Currently a study can only have one script. Interviewing different user types/personas can often require a different interview structure with persona-specific questions. Currently, this has to be built into a single script structure and it can be hard to know which questions an interviewer should be asking based on the script structure if it has questions across many user/persona types.

Hard to manage studies that are across many user types/personas to ensure consistent interview structures and questions

Support having different script templates per user persona/type within a single study