ENH: Add a force argument to `numpy()` (#78564)
**Reopened** to help with merge issues. See #59790 for full context.
Fixes #20778. Helps #71688.
Finalizes @martinPasen's force argument for `Tensor.numpy()`. It is set to False by default. If it's set to True then we:
1. detatch the Tensor, if requires_grad == True
2. move to cpu, if not on cpu already
3. Uses .resolve_conj() if .is_conj() == True
4. Uses .resolve_neg() if .is_neg() == True
cc @albanD
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78564
Approved by: https://github.com/albanD
