Organize and add examples #3771

Job	Run time
git_checks	7s
format	29s
linux_ubuntu (ubuntu20.04, gcc8, shared, ompi)	42m 13s
docker (ubuntu-bionic)	12m 12s
CodeQL (cpp)	34m 15s
linux_ubuntu (ubuntu20.04, gcc9, shared, ompi)	38m 3s
linux_el8 (el8, icc, ompi)	1h 3m 4s
linux_ubuntu (ubuntu20.04, gcc10, shared, ompi)	36m 42s
linux_el8 (el8, oneapi, ompi)	56m 52s
macos (macos11, serial)	5m 16s
windows (win2019, serial)	16m 10s
macos (macos12, serial)	3m 44s
linux_ubuntu (ubuntu20.04, gcc11, shared, ompi)	34m 35s
windows (win2019, ompi)	23m 43s
linux_ubuntu (ubuntu20.04, clang6, shared, ompi)	28m 5s
windows (win2022, serial)	14m 31s
linux_ubuntu (ubuntu20.04, clang10, shared, ompi)	32m 13s
windows (win2022, ompi)	28m 11s
linux_ubuntu (ubuntu20.04, gcc10, mpich)	58m 20s
linux_ubuntu (ubuntu20.04, gcc8, serial)	9m 47s
linux_ubuntu (ubuntu20.04, clang6, serial)	11m 22s
linux_ubuntu (ubuntu20.04, gcc8, static, ompi, build_only)	13m 10s
linux_ubuntu (ubuntu20.04, clang6, static, ompi, build_only)	11m 31s
linux_ubuntu (ubuntu20.04, gcc8, static, serial)	10m 45s
contract (lammps)	7m 3s
contract (tau)	19m 41s
build_and_test	3s
	10h 12m 7s

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