RFC for the task arena waiting functionality #3664

Job	Run time
examples_clang-format	7s
python_module_test_ubuntu_latest	35s
doc_examples_ubuntu-latest_g++_cxx20_relwithdebinfo	42s
codespell	17s
copyright_check	4s
examples_ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	3m 45s
ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	20m 16s
examples_ubuntu-20.04_g++_cxx17_release_preview=ON	3m 54s
examples_macos-15_clang++_cxx14_relwithdebinfo_preview=ON	2m 40s
ubuntu-20.04_g++_cxx17_release_preview=ON	18m 16s
examples_ubuntu-20.04_g++-10_cxx20_debug_preview=ON	4m 37s
ubuntu-20.04_g++-10_cxx20_debug_preview=ON	14m 55s
ubuntu-22.04_g++-11_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	17m 12s
macos-14_clang++_cxx14_relwithdebinfo_preview=ON	10m 41s
macos-13_clang++_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	23m 40s
examples_windows_cl2019_cxx14_relwithdebinfo_preview=ON	5m 18s
windows_cl2019_cxx14_relwithdebinfo_preview=ON	14m 43s
examples_windows_cl2022_cxx17_relwithdebinfo_preview=OFF	6m 14s
windows_cl2019_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	20m 49s
windows_cl2022_cxx17_relwithdebinfo_preview=OFF	15m 36s
doc_examples_windows-2022_cl_cxx20_relwithdebinfo	1m 4s
documentation	54s
pages	0s
	3h 6m 19s

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