[fx] Subgraph rewriter matching on attributes (#98604)
Fixes #68534
Similar to how submodules are added, if there already exists an attribute with the same name in `gm` as in `replacement`, the attribute value in `gm` will take precedence.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98604
Approved by: https://github.com/andrewor14, https://github.com/SherlockNoMad
