[#160] add deriving of unbalanced Generic instances

Description

Problem: IsoValue instances can be automatically derived, this is based on the Generic representation of a type. Generic instance are derived forming a balance tree, which results in a balanced complex IsoValue, however we sometimes want to control the shape of this IsoValue tree.

Solution: add a module implementing the feature of automatic deriving of unbalanced Generic instances using Template Haskell.

Related issue(s)

Resolves #160 (closed)

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