Implement initial version of C++20 module `boost.any` #100

Job	Run time
windows (msvc-14.2, 14,17,latest, 32,64, windows-2019)	4m 39s
posix (gcc-12, 03,11,14,17,2a, ubuntu-22.04, cxxflags=--coverage -fsanitize=address,leak,undefine...	4m 19s
windows (gcc, 03,11,14,17,2a, 64, windows-2019)	3m 40s
posix (clang, clang++-14, 03,11,14,17,2a, ubuntu-22.04)	3m 26s
windows (msvc-14.3, 14,17,20,latest, 32,64, windows-2022)	6m 54s
posix (clang-19, 20,23, ubuntu-24.04, clang-19 llvm-19 libclang-rt-19-dev libc++-19-dev libc++abi...	3m 27s
finish	2s
	26m 27s

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