[PyTorch][Static Runtime][easy] give to_copy_functor a name

[swolchok]

Stack from ghstack:

• [PyTorch][Static Runtime] Support memory planning for to without requiring copying #67223
• [PyTorch][SR] Force liveness analysis to get aliasing right #67222
• [PyTorch][Static Runtime] Avoid managed output tensor DCHECK #67221
• [PyTorch][Static Runtime] Fix dtype changing between iterations for to() #67394
• -> [PyTorch][Static Runtime][easy] give to_copy_functor a name #67701
• [PyTorch][SR] More debug logging #67220
• [PyTorch][SR] Add more to() tests & extend debug logging in testStaticRuntime #67219

I split this out to ease rebasing and review.

Differential Revision: D32112523

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