Refactor ShellBatched Integrators #176

Job	Run time
NVIDIA Build (No Test) (OFF, OFF)	10m 20s
Release Build and Test (gnu, 12, ON, ON)	13m 22s
NVIDIA Build (No Test) (ON, OFF)	10m 16s
Debug Build and Test	18m 54s
NVIDIA Build (No Test) (OFF, ON)	10m 50s
Release Build and Test (gnu, 12, ON, OFF)	15m 43s
Release Build and Test (gnu, 12, OFF, ON)	10m 56s
Release Build and Test (gnu, 12, OFF, OFF)	13m 13s
Release Build and Test (llvm, 14, ON, OFF)	12m 14s
Release Build and Test (llvm, 14, OFF, OFF)	10m 28s
CMake Discovery	13m 49s
Build as Subproject	9m 14s
	2h 29m 19s

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