feat: add _type-id_ production for `decltype` #762

Job	Run time
build-windows	24s
build-unix-like (ubuntu-22.04, g++-10, c++20)	23s
build-unix-like (ubuntu-22.04, g++-11, c++20)	19s
build-unix-like (ubuntu-22.04, g++-11, c++2b)	20s
build-unix-like (ubuntu-22.04, g++-12, c++20)	33s
build-unix-like (ubuntu-22.04, g++-12, c++2b)	27s
build-unix-like (ubuntu-22.04, clang++-12, c++20)	27s
build-unix-like (ubuntu-22.04, clang++-14, c++20)	26s
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)	23s
build-unix-like (ubuntu-24.04, clang++-17, c++20)	29s
build-unix-like (ubuntu-24.04, clang++-18, c++20)	30s
build-unix-like (ubuntu-24.04, clang++-18, c++23)	36s
build-unix-like (ubuntu-24.04, g++-14, c++2b)	41s
	6m 40s

Provide feedback