Add an optional authentication policy to [index] configuration #1315

Job	Run time
macos-x86_64	2m 45s
sdist	2m 56s
macos-aarch64	2m 46s
windows (x86_64-pc-windows-msvc, x64)	29s
windows (i686-pc-windows-msvc, x86)	2m 48s
linux (x86_64-unknown-linux-gnu)	2m 24s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 42s
windows (aarch64-pc-windows-msvc, x64)	2m 47s
linux (i686-unknown-linux-gnu)	2m 26s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	2m 42s
linux-arm (arm-unknown-linux-musleabihf, arm)	2m 43s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 43s
linux-s390x (s390x-unknown-linux-gnu, s390x)	2m 22s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 42s
musllinux (x86_64-unknown-linux-musl)	2m 41s
musllinux (i686-unknown-linux-musl)	2m 42s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	2m 41s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	2m 43s
	46m 2s

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