CFL-limited adaptive timestepping for electrostatic solver #20512

Job	Run time
GCC 1D & 2D w/ MPI, QED tools	18m 47s
GCC Minimal w/o MPI	30m 51s
GCC 3D & RZ w/ MPI, single precision	22m 43s
GCC ABLASTR w/o MPI	41s
Clang pywarpx	13m 8s
	1h 26m 10s

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