Add `PECInsulator` boundary condition #21477

Job	Run time
GCC 1D & 2D w/ MPI, QED tools	22m 46s
GCC 3D & RZ w/ MPI, single precision	26m 51s
GCC Minimal w/o MPI	34m 20s
GCC ABLASTR w/o MPI	49s
Clang pywarpx	15m 5s
	1h 39m 51s

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