der

x509-cert: adds a serial numbers generator #2567

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 18s
build (1.65.0, wasm32-unknown-unknown)	2m 12s
build (stable, thumbv7em-none-eabi)	1m 26s
build (stable, wasm32-unknown-unknown)	1m 20s
derive (1.65.0)	1m 8s
derive (stable)	20s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.65.0, sudo apt update && sudo apt install gcc-mult...	12m 46s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	10m 16s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.65.0)	12m 23s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9m 57s
minimal-versions / minimal-versions	8m 10s
	1h 2m 16s

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