[memory viz] support larger visualizations (#98865)
When there are > 15000 polygons trace_plot starts to get really slow.
So order the allocations and take the smallest allocations beyond the 15000
limit and put them into a single summarized polygon.
A slider allows this limit to be adjusted.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98865
Approved by: https://github.com/yf225
