Extract restart read/write IO from `M2ulPhyS` #459

Job	Run time
Build/GPU (Cuda)	2m 51s
Build/GPU-CPU	14m 32s
Build/GPU (AMD/HIP)	7m 28s
cpuimage / docker env	10s
Build/CPU	36m 29s
Code style	1m 31s
Create dist tarball	3m 36s
CPU release tarball tests	32m 47s
GPU/Cuda release tarball tests	2m 49s
	1h 42m 13s

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