Specialize `formatter` for all `std::basic_string` types #6019

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 25s
build (windows-2019, Win32, v142, 17, Release)	2m 0s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 33s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 12s
build (windows-2019, x64, v140, 14, Debug)	1m 25s
build (windows-2019, x64, v140, 14, Release)	2m 1s
build (windows-2019, x64, v141, 17, Debug)	1m 23s
build (windows-2019, x64, v141, 17, Release)	2m 24s
build (windows-2019, x64, v142, 17, Debug)	1m 15s
build (windows-2019, x64, v142, 17, Release)	2m 12s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 13s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 3s
build (windows-2019, x64, v142, 20, Debug)	2m 5s
build (windows-2019, x64, v142, 20, Release)	2m 40s
build (windows-2022, x64, v143, Debug, 20)	1m 51s
mingw (mingw64)	4m 19s
mingw (ucrt64)	5m 8s
	37m 9s

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