polyval: expose FieldElement under hazmat feature
#279
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Adds a new
hazmatfeature and conditionally adds apubre-export of theFieldElementtype under a newhazmatmodule.All of its inherent methods are still private, so this just exposes the trait impls backed by the
softimplementation.We will probably need to expose some things like
InitTokenand functions likepolymulthat accept it and select between intrinsics/soft implementations to enable performance-oriented usage of this type, which is why it's being placed in ahazmatmodule where we can potentially put some of the other things that would actually make it useful.