[fx] Implement __deepcopy__ for fx.Tracer (#83130)
Copied from @jamesr66a 's example in #83116.
Implements `__deepcopy__` to skip deepcopying the elements of `_autowrap_search`, because it contains modules, which cannot/should not be deepcopied
Differential Revision: [D38560212](https://our.internmc.facebook.com/intern/diff/D38560212)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83130
Approved by: https://github.com/SherlockNoMad
