Add args() accessor back to fmt::format_context #7795

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	2m 24s
build (windows-2019, Win32, v142, 17, Release)	2m 40s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 48s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 6s
build (windows-2019, x64, v141, 14, Debug)	1m 52s
build (windows-2019, x64, v141, 14, Release)	2m 29s
build (windows-2019, x64, v141, 17, Debug)	1m 34s
build (windows-2019, x64, v141, 17, Release)	2m 30s
build (windows-2019, x64, v142, 17, Debug)	1m 10s
build (windows-2019, x64, v142, 17, Release)	2m 18s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 11s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 15s
build (windows-2019, x64, v142, 20, Debug)	1m 44s
build (windows-2019, x64, v142, 20, Release)	4m 25s
build (windows-2022, x64, v143, Debug, 20)	2m 17s
mingw (mingw64)	4m 13s
mingw (ucrt64)	4m 10s
	41m 6s

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