Add SHAKE256 #173

Job	Run time
posix (clang, clang++-12, 14,17,20, ubuntu-22.04, clang-12)	24m 22s
posix (clang, clang++-13, 14,17,20, ubuntu-22.04, clang-13)	24m 10s
posix (clang, clang++-14, 14,17,20, ubuntu-22.04, clang-14)	24m 26s
posix (clang, clang++-14, 14-gnu,17-gnu,20-gnu, ubuntu-22.04, clang-14)	24m 16s
posix (clang, clang++-15, 14,17,20, ubuntu-22.04, clang-15, deb http://apt.llvm.org/jammy/ llvm-t...	24m 17s
posix (clang, clang++-16, 14,17,20, ubuntu-22.04, clang-16, deb http://apt.llvm.org/jammy/ llvm-t...	24m 14s
posix (clang, clang++-17, 14,17,20, ubuntu-22.04, clang-17, deb http://apt.llvm.org/jammy/ llvm-t...	24m 21s
posix (clang, clang++-18, 14,17,20, ubuntu-24.04, clang-18, deb http://apt.llvm.org/noble/ llvm-t...	24m 22s
posix (clang, clang++-19, 14,17,20, ubuntu-24.04, clang-19, deb http://apt.llvm.org/noble/ llvm-t...	24m 53s
	3h 39m 21s

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