Initial support for tstore/tload #1982

Job	Run time
Build Echidna on ubuntu-20.04	21m 10s
Build Echidna on macos-13	30m 52s
Build Echidna on windows-latest	28m 52s
Test with solc 0.4.25 on ubuntu-latest	4m 46s
Test with solc 0.5.7 on ubuntu-latest	3m 39s
Test with solc 0.6.12 on ubuntu-latest	3m 31s
Test with solc 0.7.5 on ubuntu-latest	3m 43s
Test with solc 0.4.25 on windows-latest	4m 30s
Test with solc 0.5.7 on windows-latest	4m 15s
Test with solc 0.6.12 on windows-latest	5m 28s
Test with solc 0.7.5 on windows-latest	5m 9s
	1h 55m 55s

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