Add Thermal Thevenin Example (Remove Params from Others)

[BradyPlanden]

This issue is to remove the thermal parameters from non-thermal Thevenin examples:

PyBOP/examples/scripts/ecm_CMAES.py

Line 24 in 9e15f90

# "Cell thermal mass [J/K]": 1000,

At the sametime, let's add a Thevenin with thermal submodel example with those corresponding parameters. For more information on PyBaMM's thermal submodel see: https://docs.pybamm.org/en/latest/source/examples/notebooks/models/thermal-models.html

[BradyPlanden]

@Dibyendu-IITKGP, are you be able to take this one on?

[Dibyendu-IITKGP]

Not yet. I'll do it.