feat: FlowControl: add FromStr impl (#163) #335

Job	Run time
cargo-deny (advisories)	16s
lint	34s
cargo-deny (bans licenses sources)	18s
msrv-aarch64-apple-darwin / build	4m 12s
msrv-x86_64-unknown-freebsd / build	4m 24s
aarch64-apple-darwin / build	1m 17s
aarch64-apple-ios / build	1m 29s
aarch64-unknown-linux-gnu / build	51s
arm-linux-androideabi / build	29s
aarch64-unknown-linux-musl / build	1m 25s
armv7-linux-androideabi / build	26s
i686-pc-windows-gnu / build	4m 26s
i686-pc-windows-msvc / build	3m 21s
i686-unknown-linux-gnu / build	50s
i686-unknown-linux-musl / build	1m 15s
msrv-arm-linux-androideabi / build	4m 2s
msrv-x86_64-pc-windows-msvc / build	6m 8s
msrv-x86_64-unknown-linux-gnu / build	4m 14s
msrv-x86_64-unknown-linux-musl / build	4m 37s
msrv-x86_64-unknown-netbsd / build	4m 2s
x86_64-apple-darwin / build	1m 23s
x86_64-pc-windows-gnu / build	3m 8s
x86_64-pc-windows-msvc / build	4m 32s
x86_64-unknown-freebsd / build	27s
x86_64-unknown-linux-musl / build	1m 8s
x86_64-unknown-linux-gnu / build	42s
x86_64-unknown-netbsd / build	23s
	1h 0m 19s

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