Include mamba state space model dependency

[fromm-m]

System Info

modalities==0.2
ubuntu
python==3.10

🐛 Describe the bug

In #182 we had to remove the mamba dependency because it caused issues by executing the tests as "packaging" in the mamba build was error-prone.
In the mamba repository, there are problems that the library is at the moment not pip-installable state-spaces/mamba#402