Index CoverageMap and SignatureMap by codehash (for performance) #1749

Job	Run time
Build Echidna on ubuntu-20.04	3m 39s
Build Echidna on ubuntu-20.04	3m 39s
Build Echidna on macos-latest	7m 3s
Build Echidna on macos-latest	7m 3s
Build Echidna on windows-latest	8m 44s
Build Echidna on windows-latest	8m 44s
Test with solc 0.4.25 on ubuntu-latest	3m 40s
Test with solc 0.4.25 on ubuntu-latest	3m 40s
Test with solc 0.5.7 on ubuntu-latest	3m 45s
Test with solc 0.5.7 on ubuntu-latest	3m 45s
Test with solc 0.6.12 on ubuntu-latest	4m 19s
Test with solc 0.6.12 on ubuntu-latest	4m 19s
Test with solc 0.7.5 on ubuntu-latest	4m 10s
Test with solc 0.7.5 on ubuntu-latest	4m 10s
Test with solc 0.4.25 on windows-latest	5m 4s
Test with solc 0.4.25 on windows-latest	5m 4s
Test with solc 0.5.7 on windows-latest	5m 0s
Test with solc 0.5.7 on windows-latest	5m 0s
Test with solc 0.6.12 on windows-latest	4m 46s
Test with solc 0.6.12 on windows-latest	4m 46s
Test with solc 0.7.5 on windows-latest	5m 20s
Test with solc 0.7.5 on windows-latest	6m 24s
	1h 52m 4s

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