Replacement for `chimney's` partial transformations

[arainko]

I was originally not going to tackle this but I've found a really compelling use case in conjunction with newtypes that need to be validated.

It works perfectly because we can create an instance of a PartialTransformer (TransformerF from chimney) in the companion object of such a newtype for free which will make composing case classes made up of such newtypes a one liner instead of eg. (value1, value2, value3, ...).mapN(CaseClass.apply) given that a case class/method we use to transform to has the correct fields - this is especially helpful when working with generated code (eg. guardrail, smithy4s etc.)