Ensure plugin helpers get component copies#704
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This PR passes the copied structure rather than the original to the helpers. This avoids issues if the plugin helper mutates the component.
It also uses deepcopies, to be safer. It might be a bit overkill but the cost is low anyway. This could bring issues if someone passed non-deepcopiable stuff to a custom plugin, but this issue is not really new as we already deepcopy in
APISpec.path.