Fix Inspector losing debug handles when given an ETRecord object

[u7k4rs6]

Summary

If you pass an ETRecord object to the Inspector (Inspector(etdump_path=..., etrecord=program_manager.get_etrecord())) instead of a path, debug handle resolution quietly finds nothing. The ETRecord object keys _debug_handle_map, _delegate_map and _instruction_id_to_num_outs_map by int instruction id, but once an ETRecord goes through save() / parse_etrecord() (JSON) the keys are strs, and _gen_resolve_debug_handles looks them up as strs. So with the object every event ends up with debug_handles=None and no op_types, and things like calculate_numeric_gap just return an empty DataFrame. No error or warning.

The fix converts those keys to str once in _consume_etrecord, before handing the maps to the event blocks. It builds new dicts, so the caller's ETRecord isn't modified, and the file path case behaves the same as before.

Test plan

Added test_inspector_with_etrecord_object_resolves_debug_handles to devtools/inspector/tests/inspector_test.py. It builds one Inspector from the ETRecord object and one from the same ETRecord saved to a file, and checks they resolve the same debug handles and op types. It fails on main (the object version gets None) and passes with the fix, and the rest of devtools/inspector/tests passes. ufmt and flake8 are clean with the versions from requirements-lintrunner.txt.

cc @nil-is-all

[pytorch-bot]

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[u7k4rs6]

@pytorchbot label "release notes: devtools"