Add cista::raw::string overload of parse_value (#19) #130

Job	Run time
formatting	32s
build (MacOS Release, clang++, clang, Release, -stdlib=libc++, macos-latest)	20s
build (GCC 10 Release, g++-10, gcc-10, Release, ubuntu-20.04)	24s
build (GCC 10 Release, g++-10, gcc-10, Release, ubuntu-20.04)	23s
build (GCC 10 Debug, g++-10, gcc-10, Debug, ubuntu-20.04)	33s
build (Clang 14 Release, clang++-14, clang-14, Release, -stdlib=libc++, -lc++abi, ubuntu-20.04)	50s
build (Clang Tidy, clang++-14, clang-14, Debug, -stdlib=libc++, -lc++abi, true, ubuntu-20.04)	51s
build (GCC 10 Sanitizer, g++-10, gcc-10, Release, -fsanitize=address,undefined -fno-omit-frame-po...	39s
	4m 32s

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