[ao] Add method in ModelReport to generate visualizer (#81589)
Summary: We created a ModelReportVisualizer class, and the primary
way it is envisioned that it is accessed is:
```
model_report_visualizer = model_reporter.generate_visualizer()
```
This method only works after reports have been generated and it takes in
the generated reports and reformats them to be ordered by module, into
the format required by the ModelReportVisualization. It then generates
the visualizer instance and returns that to the user.
Test Plan: python test/test_quantization.py TestFxModelReportClass.test_generate_visualizer
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/81589
Approved by: https://github.com/andrewor14
