Type annotation for `torch/_dynamo/output_graph.py` (#159602)
Summary:
As part of better engineering effort, we would like to improve out type support to improve dev experience in dynamo
This PR adds strict typing support to `torch/_dynamo/output_graph.py`
Running
```
mypy torch/_dynamo/output_graph.py --linecount-report /tmp/coverage_log
```
| -------- | Lines Annotated | Lines Total | % lines covered | Funcs Annotated | Funcs Total | % funcs covered |
| -------- | ------- | -------- | ------- | ------- | ------- | ------- |
| Main | 2163 | 4792 | 45.14% | 121 | 268 | 45.15% |
| This PR | 4818 | 4818 | 100.00% | 268 | 268 | 100.00% |
| Delta | +2655 | +26 | +54.84% | +147 | 0 | +54.85% |
X-link: https://github.com/pytorch/pytorch/pull/159602
Approved by: https://github.com/Skylion007
Reviewed By: izaitsevfb
Differential Revision: D79620187
fbshipit-source-id: 59099170ea9eab4f49c73452b38a74ed84238d79
