Implement `iMultiFab` #1059

Job	Run time
🔄 Update Stub Files / Stubs	4m 23s
🐧 Ubuntu / [email protected]	10m 34s
🐧 Ubuntu / [email protected] w/o MPI	3m 9s
🐧 Ubuntu / [email protected] w/ libc++ w/ MPI	10m 42s
🐧 Ubuntu / [email protected] Debug	13m 44s
🐧 Ubuntu / [email protected] [email protected]	4m 17s
🪟 Windows / Clang w/o MPI Shared Debug	17m 46s
🪟 Windows / MSVC w/o MPI Static Release	18m 24s
🐧 Intel / ICPX	4m 29s
🐧 Intel / oneAPI SYCL 3D	4m 36s
🍏 macOS / [email protected] w/o MPI	6m 26s
🔎 CodeQL / Analyze (python)	3m 55s
🐧 HIP / ROCm HIP 6.1	9m 43s
🔎 CodeQL / Analyze (cpp)	18m 2s
	2h 10m 10s

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