Implement influenza model

[HenrZu]

Motivation / Current Behaviour

We want to support more diseases. Doing so, we want to implement the influenza model from https://doi.org/10.1186/s12879-017-2344-6

Enhancement description

Implement influenca model from https://doi.org/10.1186/s12879-017-2344- and adjust it to our framework.

Additional context

No response

Checklist

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