add graph_u_e to switch_energy_class

[gituser789]

Is your feature request related to a problem? Please describe.
In some datasheets, this information is given

[tinix84]

Can you share the screenshot of the datasheet?

[gituser789]

Find an example datasheet here:
https://fscdn.rohm.com/en/products/databook/datasheet/discrete/sic/mosfet/sct3060aw7-e.pdf