Add function to combine H5 dat files #19350

Job	Run time
Clang-tidy (Debug)	31m 29s
Commits	9s
Files and formatting	5m 42s
Clang-tidy (Release)	29m 59s
Unit tests (gcc-9, Debug)	1h 44m 26s
Unit tests (gcc-9, Release)	2h 31m 53s
Archs (gcc-9)	27m 21s
Unit tests (gcc-10, Debug)	1h 48m 45s
Unit tests on macOS (x86, 13, 4)	2h 15m 23s
Archs (gcc-10)	36m 33s
Unit tests (gcc-10, Release)	2h 49m 21s
Unit tests on macOS (arm64, 14, 3)	1h 19m 57s
Archs (clang-13)	36m 32s
Unit tests (gcc-11, Debug)	1h 49m 8s
Archs (clang-14)	45m 5s
Unit tests (gcc-11, Release)	51m 47s
Unit tests (clang-13, Release, OFF, OFF, JEMALLOC)	2h 41m 33s
Unit tests (clang-13, Debug, OFF, OFF, normal)	1h 30m 8s
Unit tests (clang-14, Debug, ON, OFF, JEMALLOC, 2)	1h 52m 10s
Unit tests (clang-14, Release, 3.18.2, /work/charm_7_0_0/mpi-linux-x86_64-smp-clang, 3, ON, ON)	2h 43m 54s
Documentation	12m 25s
Deploy documentation	0s
Release version	0s
	1d 3h 43m 40s

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