Add generic model utilities and validators (from Ribasim-NL)

[evetion]

To be downstreamed from Deltares/Ribasim-NL#129

• remove_node remove a node, possibility to remove connected_edges as well
• remove_edge: remove an edge, possibility to remove disconnected_nodes as well
• reverse_edge: reverse an edge and it's from and to properties

I'd also copy (via templating ideally) some validation from Julia to Python:

• Allowed node neighbors
• Number of neighbors

Some more validation on geometries

• Edge geometry requires begin/end to match with nodes
• Basin/area geometry requires to intersect with the basin node

Furthermore I can imagine we error on creating, and on writing, but allow for reading a model into memory, but give a warning?

[visr]

Also running a model is a candidate for this. run_model.py contains a version that makes some assumptions on the model being written, ribasim being in the path etc.