added support to read back from H5T_STRING VARIABLES #4523

Job	Run time
git_checks	5s
format	27s
linux_el8 (el8, icc, mpich)	24m 42s
linux_el8 (el8, oneapi, mpich)	23m 4s
docker (ubuntu-bionic)	7m 52s
CodeQL (cpp)	23m 47s
linux_ubuntu (ubuntu20.04, gcc8, shared, mpich)	15m 18s
macos (macos-11, shared)	28m 55s
linux_ubuntu (ubuntu20.04, gcc9, shared, mpich)	17m 38s
windows (win2019, shared, serial)	11m 1s
linux_ubuntu (ubuntu20.04, gcc10, shared, mpich)	17m 12s
macos (macos-12, static)	2m 59s
windows (win2019, shared, ompi)	15m 8s
macos (macos-12, shared)	14m 36s
linux_ubuntu (ubuntu20.04, gcc11, shared, mpich)	16m 36s
windows (win2022, shared, serial)	9m 8s
linux_ubuntu (ubuntu20.04, clang6, shared, mpich)	10m 16s
linux_ubuntu (ubuntu20.04, clang10, shared, mpich)	14m 20s
linux_ubuntu (ubuntu20.04, gcc8, ompi)	36m 25s
windows (win2022, shared, ompi)	13m 59s
windows (win2022, static, serial, windows-2022, vs2022)	10m 37s
linux_ubuntu (ubuntu20.04, gcc8, serial)	9m 6s
linux_ubuntu (ubuntu20.04, clang6, ompi)	29m 0s
linux_ubuntu (ubuntu20.04, clang6, serial)	7m 44s
linux_ubuntu (ubuntu20.04, gcc8, static, ompi, build_only)	7m 19s
linux_ubuntu (ubuntu20.04, clang6, static, ompi, build_only)	4m 4s
linux_ubuntu (ubuntu20.04, gcc8, static, serial)	8m 8s
contract (examples)	2m 9s
contract (lammps)	4m 4s
contract (tau)	10m 39s
build_and_test	1s
	6h 36m 19s

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