feat: Multi threading support for circom prover #4489

Job	Run time
matrix	17s
linting	10s
coverage	12m 37s
build / linux-unittest-amd64-v2.0.14	16m 43s
build / linux-contract-amd64-v2.0.14	8m 56s
build / linux-integration-amd64-v2.0.14	1h 45m 35s
build / linux-tools-amd64-v2.0.14	7m 57s
build / macos-unittest-amd64-v2.0.14	18m 10s
build / macos-contract-amd64-v2.0.14	11m 59s
build / macos-integration-amd64-v2.0.14	1h 45m 14s
build / macos-tools-amd64-v2.0.14	10m 16s
build / windows-unittest-amd64-v2.0.14	19m 13s
build / windows-contract-amd64-v2.0.14	12m 20s
build / windows-integration-amd64-v2.0.14	1h 45m 42s
build / windows-tools-amd64-v2.0.14	12m 29s
build / status	1s
	7h 27m 39s

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