Implement model in which the mobility is integrated into the ODEs

### Feature description

We want to implement an ODE model in which the mobility is integrated into the ODEs rather than the graph approach. This follows [Liu et al.](https://pubmed.ncbi.nlm.nih.gov/35603124/)

### Additional context

_No response_

### Checklist

- [X] Attached labels, especially loc:: or model:: labels.
- [X] Linked to project.