[TM-331] Add more integrational validators
Description
Some validators are need to be added into integrational testing engine such as validating the contract for value presence in its storage and checking whether the contract satisfies the given set of entrypoints.
Related issue(s)
Resolves TM-331
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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Edited by Anton Myasnikov