Make AnyKind Clone and Copy

[gzp79]

Could you please make AnyKind derive Copy and Clone ?
That'd help me a lot. Now I need to create another enum and cannot use AnyKind directly.

[Freyskeyd]

Hello,

I don't see any issue to make AnyKind Copy which will also allow Clone.

[yuyawk]

I resolved this issue at #1474 , but am waiting for reviewers to approve my PR.

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