Use Times for Exposed and INS compartment directly instead of implicitly over SerialInterval and Incubation period

[HenrZu]

Motivation / Current Behaviour

Bc the Calculation of the RateEand RateINS are hard to understand, we should use them directly. Also, the given constraints for the parameters IncubationTimeand SerialInterval are a bit random and not well explained.

Enhancement description

Remove the parameters IncubationTimeand SerialInterval and use the Times / Rates directly as parameters.

Additional context

No response

Checklist

• [x] Attached labels, especially loc:: or model:: labels.
• [x] Linked to project