[FEATURE] - Add colab examples

Describe the feature and the current behavior/state

Right now there are no examples "click and go", to run on Google Colab. There are no notebooks that explain and show how to use AshPy and why this solution should be better or more useful than using the pure Keras API or other solutions.

Will this change the current api? How?

No, it doesn't.

Who will benefit with this feature?

Everyone. Since, OK examples in the documentation and in the README are cool, but having some colab notebook is more powerful and easy to share (moreover, it's more catchy and people love executing cells and learning)