[PyTorch] Add aten::view_as

[huanmei9]

support aten::view_as op for the frontend of pytorch. The info of this op is available at this link.

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[junrushao]

Relay doesn't support tensor aliasing, meaning it could potentially lead to certain underlying issues if not taken good care of. However, there's unfortunately no alternative approach forward with Relay due to its design limitation, and therefore, I'd prefer merging this in

[huanmei9]

@junrushao
Thanks for your reply. BTW, what is tensor aliasing, and could you provide an example?