[#705] Parameterize generators with a Range

Description

Problem: Cleveland exposes many hedgehog generators. For some types, like Mutez, we provide two generators. One that generates an arbitrary value among all possible values (genMutez) and another that lets the user specify the range (genMutez'). We should do this across the board, where it makes sense. Additionally, it might be good to avoid duplicating the interface.

Solution: Define instances Default (Range a) for types of interest (occasionally wrapped in newtypes). Add range parameters to generators where it makes sense.

Additionally, I've discovered that genValidType doesn't use its mustBeValid argument, so that's been removed.

Related issue(s)

Resolves #705 (closed)

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