Implement injection of particles from the embedded boundary #21121

Job	Run time
GCC 1D & 2D w/ MPI, QED tools	2m 5s
GCC 3D & RZ w/ MPI, single precision	5m 23s
GCC Minimal w/o MPI	15m 20s
GCC ABLASTR w/o MPI	41s
Clang pywarpx	7m 24s
	30m 53s

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