pymdp is doing too much itself as a package

[Arun-Niranjan]

Ideally we want to use pymdp in production, and have as streamlined a package as possible with as few dependencies as possible.

currently pydmp has dependencies on e.g. matplotlib, pillow and seaborn to be able to demonstrate the capabilities of agents. Whilst this is great for educational purposes, these are heavy deps and would often not be needed in production.

I would suggest moving code that requires the heavy stuff out into a separate repository under the inferactively project, e.g. inferactively/pymdp-demos which can then use inferactively/pymdp itself as a dependency