Create minimal hybrid graph model

[jubicker]

Feature description

Create graph model where abms can be used in some nodes and ode models can be used in other nodes.

Additional context

It should be considered

• how infection states are assigned to agents due to compartment sizes
• how migration works between abm and ode nodes (which parameters are used etc.)

Checklist

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