Add support for `del` (#31273)
Summary:
Adds the `del` keyword to the parser and corresponding `aten::Delete` op for lists and dicts
Fixes #20615
](https://our.intern.facebook.com/intern/diff/19181473/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31273
Pulled By: driazati
Differential Revision: D19181473
fbshipit-source-id: c42a2d43ec361a98e0c425232981edc9c39388c4
