Implement variant-specific attributes #27
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This PR adds support for applying different attributes to each variant. I want this primarily to integrate with a new library I'm working on,
metastruct, which could be used to generate field mapping macros for superstruct variant structs. Each macro needs a unique name, so we need to make a differentmetastructcall for each variant.There's an example of
metastructusage here: https://github.com/sigp/metastruct/blob/662cde78840c6cdfd6e688c155b87c6b4f1300d2/examples/hello_world.rs#L3-L6