Add read-flash support #378

Job	Run time
Unit Tests (x86_64-unknown-linux-gnu)	28s
Unit Tests (aarch64-unknown-linux-gnu)	1m 14s
Unit Tests (armv7-unknown-linux-gnueabihf)	1m 43s
Check lib (x86_64-unknown-linux-gnu)	27s
Clippy (x86_64-unknown-linux-gnu)	23s
Check lib (aarch64-unknown-linux-gnu)	1m 27s
Check (x86_64-apple-darwin)	41s
Clippy (aarch64-unknown-linux-gnu)	1m 33s
Check MSRV (x86_64-unknown-linux-gnu)	28s
Check lib (armv7-unknown-linux-gnueabihf)	1m 24s
Clippy (armv7-unknown-linux-gnueabihf)	1m 43s
Check (x86_64-unknown-linux-gnu)	23s
Check MSRV (aarch64-unknown-linux-gnu)	1m 57s
Check (x86_64-unknown-linux-musl)	39s
Check MSRV (armv7-unknown-linux-gnueabihf)	1m 37s
Rustfmt	6s
Check (x86_64-pc-windows-msvc)	2m 14s
Check (aarch64-unknown-linux-gnu)	1m 26s
Check (armv7-unknown-linux-gnueabihf)	1m 23s
	21m 16s

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