[TM-288] Add `parseLorentzValue`

Description

Problem: it's not easy to convert Michelson values into Lorentz values. We have printLorentzValue which does the opposite (Lorentz → textual Michelson), but no function for parsing. Such a function is useful when you know that something happened in the network and want to figure out what it means in terms of your application.

Solution: add parseLorentzValue which parses a string into untyped Michelson value, typechecks it and converts to a plain Haskell value. Also a helper function has been added for simple value parsing.

Related issue(s)

https://issues.serokell.io/issue/TM-288

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