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e9354264 - Support list subclasses and fix dict subclasses mutation bugs (#146819)

Support list subclasses and fix dict subclasses mutation bugs (#146819) Summary: This PR adds support for list subclasses. Among other things are 1) Tracking the mutations on internal vts like `_dict_vt` and `_list_vt` using sources. This helps identify if there was a mutation in the underlying data structures, and we need to reconstruct it. 2) `UserDefinedObjectVariable` now has a new method - `is_modified` which `side_effect` infra relies upon to check mutations in the underlying vts (like `_dict_vt`). 3) `reconstruction` logic ensures that we use `dict.__getitem__` and `list.__getitem__` methods. This is super important because we don't want to call the overridden `__getitem__` methods. If this PR is hard to review, please let me know. I can break it into several small PRs. X-link: https://github.com/pytorch/pytorch/pull/146819 Approved by: https://github.com/StrongerXi, https://github.com/jansel Reviewed By: huydhn Differential Revision: D69537369 fbshipit-source-id: 9c20f4ee84c91639c320a3a04a1a153859623ab6