Add support for microseconds, closes #684 #551

Job	Run time
Extract crate metadata	4s
Ensure 'cargo fmt' has been run	5s
Minimum supported rust version	5m 31s
aarch64-unknown-linux-gnu (ubuntu-20.04)	3m 42s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	2m 45s
arm-unknown-linux-musleabihf (ubuntu-20.04)	3m 58s
i686-pc-windows-msvc (windows-2019)	3m 59s
i686-unknown-linux-gnu (ubuntu-20.04)	2m 33s
i686-unknown-linux-musl (ubuntu-20.04)	2m 34s
x86_64-apple-darwin (macos-12)	3m 20s
x86_64-pc-windows-gnu (windows-2019)	5m 26s
x86_64-pc-windows-msvc (windows-2019)	4m 27s
x86_64-unknown-linux-gnu (ubuntu-20.04)	2m 34s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 13s
Publish to Winget	0s
	44m 11s

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