Allow Neumann domain boundary conditions for the electrostatic potential (#2345)

* initial commit for adding a spatially varying potential for EBs

* refactored logic to set the boundary conditions and boundary values for the electrostatic solver

* style change

* removed extra semi-colon

* fixed issue causing oneAPI DPC++ build failure

* fixed issue that led to CI test failure

* fixed incorrect placement of definePhiBCs() call from previous commit

* avoid the more expensive function to set the EB potential if it does not vary spatially

* have to make a new parser when phi EB is only a function of time

* fixed typo in previous commit

* added option to use Neumann boundary conditions with the electrostatic solver

* cleaned up logic for whether or not boundary potential values should be set

* avoid using reference to __host__ variable

* added CI test for mixed boundary conditions for the electrostatic solver

* added documentation

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