Naming of NonNativeFieldVar and its future usage on Fq2, Fq3, Fq4, Fq6, Fq12

[weikengchen]

Summary

This issue is to raise a reconsideration of the names of NonNativeFieldVar before the next release.

Problem Definition

What we implemented is not NonNativeFieldVar but NonNativeFpVar. And in the future, there is a possibility that we would implement Fq2 etc as well.

Proposal

Change the name?

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