[fix] ltorch.to to return a copy, when copy=True

[khushi-411]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #1291

Earlier

>>> import torch
>>> import thunder
>>> from thunder.torch import to
>>> a = torch.tensor([1.0, 2.0, 3.0])
>>> def foo(a):
...     return a.to(copy=True)
... 
>>> jfoo = thunder.jit(foo)
>>> result = jfoo(a)
>>> assert result is not a
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AssertionError
>>> 

Now

>>> import torch
>>> import thunder
>>> from thunder.torch import to
>>> a = torch.tensor([1.0, 2.0, 3.0])
>>> def foo(a):
...     return a.to(copy=True)
... 
>>> jfoo = thunder.jit(foo)
>>> result = jfoo(a)
>>> assert result is not a
>>> 

PR review

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If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

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[crcrpar]

The diff looks good to me.
Could you update the title so that it explains which of what op is fixed?

[khushi-411]

Hi @crcrpar! Thank you for reviewing the PR!

Could you update the title so that it explains which of what op is fixed?

Sure, I've updated the title.

[t-vi]

Thank you @khushi-411 @crcrpar @riccardofelluga

[khushi-411]

Thanks so much for reviewing the PR, @crcrpar @riccardofelluga @t-vi!