refactor: lookup-less `sign` `relu` `abs` #4198

Job	Run time
library-tests	3m 43s
library-tests	3m 43s
model-serialization	3m 12s
model-serialization	3m 12s
build	5m 27s
build	5m 27s
docs	5m 11s
docs	5m 11s
prove-and-verify-aggr-tests-gpu	1m 54s
prove-and-verify-aggr-tests-gpu	1m 54s
ultra-overflow-tests	10m 17s
ultra-overflow-tests	10m 17s
ultra-overflow-tests_og-lookup	10m 18s
ultra-overflow-tests_og-lookup	10m 18s
python-integration-tests	1h 37m 32s
python-integration-tests	1h 37m 32s
ultra-overflow-tests-gpu	1m 58s
ultra-overflow-tests-gpu	1m 58s
examples	12m 2s
examples	12m 2s
prove-and-verify-tests	2h 39m 34s
prove-and-verify-tests	2h 39m 34s
python-tests	23m 7s
python-tests	23m 7s
mock-proving-tests	17m 8s
mock-proving-tests	14m 2s
prove-and-verify-aggr-tests	39m 55s
prove-and-verify-aggr-tests	39m 55s
accuracy-measurement-tests	42m 5s
accuracy-measurement-tests	42m 5s
prove-and-verify-aggr-evm-tests	37m 7s
prove-and-verify-aggr-evm-tests	37m 7s
prove-and-verify-evm-tests	1h 36m 0s
prove-and-verify-evm-tests	1h 36m 0s
prove-and-verify-mock-aggr-tests	15m 31s
prove-and-verify-mock-aggr-tests	15m 31s
tutorial	15m 46s
tutorial	15m 46s
wasm32-tests	7m 31s
wasm32-tests	7m 29s
	20h 7m 28s

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