Add support for reflecting expression_lists and identifiers in an exp… #900

Job	Run time
build-windows	29s
build-unix-like (ubuntu-22.04, g++-10, c++20)	24s
build-unix-like (ubuntu-22.04, g++-11, c++20)	21s
build-unix-like (ubuntu-22.04, g++-11, c++2b)	22s
build-unix-like (ubuntu-22.04, g++-12, c++20)	26s
build-unix-like (ubuntu-22.04, g++-12, c++2b)	23s
build-unix-like (ubuntu-22.04, clang++-12, c++20)	36s
build-unix-like (ubuntu-22.04, clang++-14, c++20)	29s
build-unix-like (macos-latest, clang++, c++20)	15s
build-unix-like (ubuntu-22.04, clang++-15, c++20)	27s
build-unix-like (ubuntu-24.04, clang++-16, c++20)	1m 2s
build-unix-like (ubuntu-24.04, clang++-17, c++20)	38s
build-unix-like (ubuntu-24.04, clang++-18, c++20)	27s
build-unix-like (ubuntu-24.04, clang++-18, c++23)	47s
build-unix-like (ubuntu-24.04, g++-14, c++2b)	21s
	7m 27s

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