Add an optional authentication policy to [index] configuration #1307

Job	Run time
sdist	11m 12s
macos-aarch64	13m 55s
macos-x86_64	10m 44s
windows (x86_64-pc-windows-msvc, x64)	16m 36s
linux (x86_64-unknown-linux-gnu)	8m 57s
windows (i686-pc-windows-msvc, x86)	17m 12s
linux (i686-unknown-linux-gnu)	12m 20s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	13m 1s
windows (aarch64-pc-windows-msvc, x64)	19m 0s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	12m 40s
linux-s390x (s390x-unknown-linux-gnu, s390x)	15m 16s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	12m 58s
linux-arm (arm-unknown-linux-musleabihf, arm)	12m 39s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	12m 27s
musllinux (x86_64-unknown-linux-musl)	13m 6s
musllinux (i686-unknown-linux-musl)	12m 24s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	13m 41s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	13m 11s
	4h 1m 19s

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