[ONNX] Improve diagnostic message formatting (#87830)
* Reflect required arguments in method signature for each diagnostic rule. Previous design accepts arbitrary sized tuple which is hard to use and prone to error.
* Removed `DiagnosticTool` to keep things compact.
* Removed specifying supported rule set for tool(context) and checking if rule of reported diagnostic falls inside the set, to keep things compact.
* Initial overview markdown file.
* Change `full_description` definition. Now `text` field should not be empty. And its markdown should be stored in `markdown` field.
* Change `message_default_template` to allow only named fields (excluding numeric fields). `field_name` provides clarity on what argument is expected.
* Added `diagnose` api to `torch.onnx._internal.diagnostics`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87830
Approved by: https://github.com/abock
