[#357] Make it possible to customize field annotations

Description

Problem: Sometimes we want annotations to differ from Haskell names. E.g. Our Haskell names may have prefixes or there may be a reason to have a specific annotation that is not a valid Haskell name.

Solution: Allow customization of field annotations by setting annOptions in the HasAnnotation instance of the types.

Related issue(s)

Resolves #357 (closed)

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