Implement injection of particles from the embedded boundary #21098

Job	Run time
GCC 1D & 2D w/ MPI, QED tools	2m 30s
GCC Minimal w/o MPI	15m 15s
GCC 3D & RZ w/ MPI, single precision	5m 0s
GCC ABLASTR w/o MPI	44s
Clang pywarpx	7m 14s
	30m 43s

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