[Quantization] Make annotation util functions return annotated nodes (#107106)
Summary:
Having annotation functions return nodes that are annotated is useful
specifically for adding "quantization_tag" to those nodes
Test Plan:
CI
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: [D48488415](https://our.internmc.facebook.com/intern/diff/D48488415)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107106
Approved by: https://github.com/jerryzh168
ghstack dependencies: #107105
