polyval: consolidate single PolyvalGeneric struct
#276
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Consolidates the many (nested, via unions!) repeated
Polyvalstructs found throughout the crate for each backend into a singlePolyval(Generic)struct which imlements theuniversal-hashinterface in a single place.FieldElementnow defers decoding into SIMD registers until we're ready to actually perform a field operation, so we can use that as a common type for all field backends (and already implemented this in previous commits).Backends are now just free functions that operate on
FieldElement, making them dramatically simpler.