Introduce memory stacks for free (#106758)
Previously when we recorded a free action in a memory trace, we would provide
the stack for when the block was allocated. This is faster because we do not
have to record stacks for free, which would otherwise double the number of stacks
collected. However, sometimes knowing the location of a free is useful for
figuring out why a tensor was live. So this PR adds this behavior. If
performance ends up being a concern the old behavior is possible by passing
"alloc" to the context argument rather than "all".
Also refactors some of glue logic to be consistent across C++ and Python and
routes the Python API through the C++ version.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106758
Approved by: https://github.com/albanD
