[FEAT]: Thermoelectric heating in calc_electron_temperature #168
Description
Continuation of #24
All sources of e- temperature are in & working, but thermoelectric currents.
The input option is there & a function is (very) loosely in place. Just needs the gradient of J (in dipole coordinates). should be quick once that is done.
The rest of e- temp is from GITM so this can be taken from there as well.