[ONNX] Introduce ONNXScopeName (#82038)
Update `_setup_trace_module_map` to always record module/layer info
in `Scope` attribute for nodes.
Extend `Scope` name to not only record module typename, but also
module object variable name. Both names are formatted and stored
as `name` attribute in `Scope`.
Introduce `ONNXScopeName` class to manage the formatting and parsing.
Updated local function export code adjusting to this update.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82038
Approved by: https://github.com/AllenTiTaiWang, https://github.com/justinchuby, https://github.com/abock, https://github.com/malfet
