[c10d] switch Store to be managed by intrusive_ptr (#47074)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47074
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D24667128
Pulled By: wanchaol
fbshipit-source-id: 9b6024c31c851b7c3243540f460ae57323da523b
