[PyTorch] Add annotation_str benchmark (#96496)
To be used to evaluate performance of following improvements. Baseline numbers:
https://gist.github.com/swolchok/c8bcb92be1dc6e67c4f7efad498becd5
Differential Revision: [D43919653](https://our.internmc.facebook.com/intern/diff/D43919653/)
**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D43919653/)!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96496
Approved by: https://github.com/Skylion007
