API: Use u8 instead of hex str #318

Job	Run time
check-style	17s
unit-tests (cb-hacspec, ead-none)	55s
unit-tests (cb-hacspec, ead-zeroconf)	1m 9s
unit-tests (cb-psa, ead-none)	1m 1s
unit-tests (cb-psa, ead-zeroconf)	1m 10s
build-coap-example	1m 45s
build-static-lib-and-headers (cb-psa-baremetal)	1m 38s
build-example-for-cortex-m4 (cb-psa, ead-none)	2m 26s
build-edhoc-package (cb-hacspec, ead-none)	1m 34s
build-example-for-cortex-m4 (cb-psa, ead-zeroconf)	2m 0s
build-static-lib-and-headers (cb-cryptocell310)	1m 24s
build-edhoc-package (cb-hacspec, ead-zeroconf)	2m 6s
build-example-for-cortex-m4 (cb-cryptocell310, ead-none)	1m 39s
generate-fstar	30m 26s
build-edhoc-package (cb-psa, ead-none)	1m 37s
build-example-for-cortex-m4 (cb-cryptocell310, ead-zeroconf)	1m 42s
run-example-on-qemu (cb-psa, ead-none)	2m 51s
build-edhoc-package (cb-psa, ead-zeroconf)	1m 59s
build-edhoc-package (cb-psa-baremetal, ead-none)	1m 52s
run-example-on-qemu (cb-psa, ead-zeroconf)	2m 33s
build-edhoc-package (cb-psa-baremetal, ead-zeroconf)	1m 50s
build-edhoc-package (cb-cryptocell310, ead-none)	1m 31s
build-edhoc-package (cb-cryptocell310, ead-zeroconf)	1m 24s
release	0s
	1h 6m 49s

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