Add `checksum-md5` command #298

Job	Run time
Check lib (x86_64-unknown-linux-gnu)	35s
Clippy (x86_64-unknown-linux-gnu)	32s
Check (x86_64-apple-darwin)	35s
Clippy (aarch64-unknown-linux-gnu)	1m 38s
Check lib (aarch64-unknown-linux-gnu)	1m 2s
Check MSRV (x86_64-unknown-linux-gnu)	36s
Check (x86_64-unknown-linux-gnu)	34s
Check lib (armv7-unknown-linux-gnueabihf)	1m 17s
Clippy (armv7-unknown-linux-gnueabihf)	1m 22s
Check MSRV (aarch64-unknown-linux-gnu)	1m 33s
Check (x86_64-unknown-linux-musl)	26s
Check MSRV (armv7-unknown-linux-gnueabihf)	2m 12s
Check (x86_64-pc-windows-msvc)	2m 59s
Check (aarch64-unknown-linux-gnu)	1m 41s
Check (armv7-unknown-linux-gnueabihf)	1m 41s
Rustfmt	6s
Unit Tests (x86_64-unknown-linux-gnu)	44s
Unit Tests (aarch64-unknown-linux-gnu)	1m 30s
Unit Tests (armv7-unknown-linux-gnueabihf)	1m 17s
	22m 20s

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