feat: implement new optimal control example

[YousefElbrolosy]

I have created a new folder under tutorials-v5 called quantum optimal control, to include examples of how to apply optimal control algorithms, since many of the linked examples to qutip-notebooks (https://qutip.org/qutip-tutorials/) are now outdated.

This is an updated implementation using qutip_qtrl based on the deprecated notebook of GRAPE CNOT implementation by Robert Johansson

Was directed here by @hodgestar after a pull request to fix an outdated notebook in https://github.com/qutip/qutip-notebooks

[pmenczel]

Hi and thank you for contributing. Migrating optimal control notebooks to qutip-tutorials and updating them is very good work!

Please have a look at the main page of this repository. This repository does not contain tutorials in ipynb format, but rather in jupytext markdown format. In markdown format, it will be easier to review the contents of the notebook.

@rochisha0 is also migrating optimal control notebooks in PR #122. However, this one here still seems to be missing from the other PR, so that is good. Could you please have a look at the other PR and follow the folder structure there?

[YousefElbrolosy]

Done!