Add tutorial on interfacing scqubits with SymPy for symbolic quantum analysis

[mhmohona]

PR Description:

This PR adds a new Jupyter notebook tutorial titled demo_sympy_interface.ipynb, which demonstrates how to interface scqubits with SymPy for symbolic quantum analysis.

Overview:

The notebook showcases how one can use SymPy in tandem with scqubits to:

• Perform symbolic manipulation of quantum operators and circuit Hamiltonians.
• Extract analytical insights into superconducting circuit models.
• Explore the physics of a superconducting qubit system with hybrid symbolic–numerical methods.

Close: #266

cc: @petergthatsme

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[mhmohona]

Hello @petergthatsme, I have added "some small example". If you have time, please have a look at this PR. I have uploaded this notebook to Google colab for better visibility, hope it will help.

Thanks!