Implement injection of particles from the embedded boundary #21118

Job	Run time
GCC Minimal w/o MPI	3m 2s
GCC 1D & 2D w/ MPI, QED tools	3m 1s
GCC 3D & RZ w/ MPI, single precision	3m 0s
GCC ABLASTR w/o MPI	50s
Clang pywarpx	3m 0s
	12m 53s

Provide feedback