[ONNX] Diagnostic to show all unsupported call_functions (#100451)
Introduce `Analysis` to analyze fx graphmodule and emit diagnostics. This class
can be extended to interact with `Transform` (passes) to decide if a pass should
trigger based on graph analysis result. E.g., if decomp needs to run by checking
operator namespace in nodes. For now leaving it as out of scope but can revisit
if maintaining multi fx extractor becomes reality.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100451
Approved by: https://github.com/titaiwangms
