feat: Multi threading support for circom prover #4474

Job	Run time
matrix	17s
coverage	20m 16s
linting	10s
build / linux-unittest-amd64-v2.0.14	18m 34s
build / linux-contract-amd64-v2.0.14	8m 54s
build / linux-integration-amd64-v2.0.14	1h 43m 46s
build / linux-tools-amd64-v2.0.14	8m 5s
build / macos-unittest-amd64-v2.0.14	21m 23s
build / macos-contract-amd64-v2.0.14	11m 24s
build / macos-integration-amd64-v2.0.14	1h 44m 18s
build / macos-tools-amd64-v2.0.14	9m 19s
build / windows-unittest-amd64-v2.0.14	36m 20s
build / windows-contract-amd64-v2.0.14	10m 46s
build / windows-integration-amd64-v2.0.14	1h 44m 8s
build / windows-tools-amd64-v2.0.14	11m 29s
build / status	1s
	7h 49m 10s

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