gh-98: Incorporate mochi class

[LisaGoh]

📌 Related Issue

Closes #98

✨ What’s been added or changed?

• Created the notebook cosmology-mochi-class-parametrisation.ipynb to demonstrate the functionalities of the mochiclass cosmology Protocol, as well as implementation of the stable basis parametrisation

🧪 How was it tested?

📸 Screenshots (if applicable)

🧠 Anything to keep in mind?

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[LisaGoh]

I've cleaned up the mochi_class_cosmology notebook, and deleted the data files so that it automatically wget's it from the mochi_class_public repo