[FX] Add a metadata dict to Node and switch shapeprop to use that (#54926)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/54926
Test Plan: Imported from OSS
Reviewed By: ansley
Differential Revision: D27417801
Pulled By: jamesr66a
fbshipit-source-id: 68a5155120a235065f58aa64ba1a6a97818dd0c1
