[Memory Snapshot] Add Total memory used after allocation in Trace View (#120339)
Summary: Being able to see max allocated helps improve user experience with memory snapshots.
Test Plan:
Before:
After:
Reviewed By: zdevito
Differential Revision: D53953648
Pulled By: aaronenyeshi
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120339
Approved by: https://github.com/zdevito
