Add RFC for CTAD in blocked_nd_range #3520

Job	Run time
copyright_check	7s
codespell	14s
examples_clang-format	14s
examples_ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	3m 46s
ubuntu-latest_g++_cxx14_relwithdebinfo_preview=OFF	19m 29s
examples_ubuntu-20.04_g++_cxx17_release_preview=ON	3m 47s
ubuntu-20.04_g++_cxx17_release_preview=ON	17m 42s
examples_ubuntu-20.04_g++-10_cxx20_debug_preview=ON	4m 35s
ubuntu-20.04_g++-10_cxx20_debug_preview=ON	13m 58s
ubuntu-22.04_g++-11_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	16m 45s
examples_macos-15_clang++_cxx14_relwithdebinfo_preview=ON	2m 38s
macos-14_clang++_cxx14_relwithdebinfo_preview=ON	11m 55s
python_module_test_ubuntu_latest	38s
macos-13_clang++_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	20m 4s
examples_windows_cl2019_cxx14_relwithdebinfo_preview=ON	6m 3s
windows_cl2019_cxx14_relwithdebinfo_preview=ON	14m 1s
examples_windows_cl2022_cxx17_relwithdebinfo_preview=OFF	6m 3s
windows_cl2019_cxx20_release_preview=ON-DBUILD_SHARED_LIBS=OFF	20m 32s
windows_cl2022_cxx17_relwithdebinfo_preview=OFF	15m 25s
documentation	48s
pages	0s
	2h 58m 44s

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