Add mcl backend #228

Job	Run time
benchmarks (ubuntu-latest, blst)	1h 37m 25s
benchmarks (ubuntu-latest, zkcrypto)	3h 6m 21s
benchmarks (ubuntu-latest, arkworks5)	44m 50s
benchmarks (ubuntu-latest, arkworks4)	1h 26m 3s
benchmarks (ubuntu-latest, arkworks3)	2h 7m 27s
benchmarks (ubuntu-latest, constantine)	1h 7m 19s
benchmarks (ubuntu-latest, mcl)	1h 22m 41s
benchmarks (windows-latest, blst)	1h 37m 31s
benchmarks (windows-latest, zkcrypto)	3h 3m 8s
benchmarks (windows-latest, arkworks5)	41m 49s
benchmarks (windows-latest, arkworks4)	1h 22m 53s
benchmarks (windows-latest, arkworks3)	2h 6m 12s
benchmarks (windows-latest, constantine)	1h 2m 51s
benchmarks (windows-latest, mcl)	2m 11s
benchmarks (macos-latest, blst)	1h 12m 2s
benchmarks (macos-latest, zkcrypto)	2h 9m 7s
benchmarks (macos-latest, arkworks5)	28m 10s
benchmarks (macos-latest, arkworks4)	57m 48s
benchmarks (macos-latest, arkworks3)	1h 36m 50s
benchmarks (macos-latest, constantine)	58m 21s
benchmarks (macos-latest, mcl)	1h 5m 40s
	1d 5h 56m 39s

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