convert more of the codebase into rust! #67

Job	Run time
linux (x86_64-unknown-linux-gnu)	1m 17s
macos-universal	3m 32s
linux (i686-unknown-linux-gnu)	1m 32s
linux-cross (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	1m 31s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	1m 38s
linux-cross (s390x-unknown-linux-gnu, s390x)	1m 33s
macos-x86_64	1m 15s
musllinux (x86_64-unknown-linux-musl)	1m 7s
linux-cross (powerpc64le-unknown-linux-gnu, ppc64le)	1m 31s
musllinux (i686-unknown-linux-musl)	56s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	1m 4s
linux-cross (powerpc64-unknown-linux-gnu, ppc64)	1m 43s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	59s
windows (x86_64-pc-windows-msvc)	1m 27s
windows (i686-pc-windows-msvc)	2m 36s
windows (aarch64-pc-windows-msvc)	3m 51s
Release	0s
	27m 32s

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