feat: Multi threading support for circom prover #4484

Job	Run time
coverage	12m 51s
matrix	19s
linting	13s
build / linux-unittest-amd64-v2.0.14	14m 53s
build / linux-contract-amd64-v2.0.14	7m 55s
build / linux-integration-amd64-v2.0.14	1h 48m 28s
build / linux-tools-amd64-v2.0.14	8m 15s
build / macos-unittest-amd64-v2.0.14	22m 31s
build / macos-contract-amd64-v2.0.14	9m 12s
build / macos-integration-amd64-v2.0.14	1h 48m 4s
build / macos-tools-amd64-v2.0.14	10m 42s
build / windows-unittest-amd64-v2.0.14	19m 32s
build / windows-contract-amd64-v2.0.14	11m 27s
build / windows-integration-amd64-v2.0.14	1h 48m 35s
build / windows-tools-amd64-v2.0.14	11m 45s
build / status	1s
	7h 34m 43s

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