cmpv2

tls_codec: implement `SerializeBytes` for `VLBytes` (#2350) #3071

Job	Run time
build (stable, thumbv7em-none-eabi)	49s
test (stable)	7m 48s
build (1.85.0, wasm32-unknown-unknown)	44s
test (1.85.0)	7m 21s
build (1.85.0, thumbv7em-none-eabi)	49s
build (stable, wasm32-unknown-unknown)	52s
minimal-versions	-1s
	18m 22s

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