Parity tests for functional optimizer step_param (#61756)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61756
DDP will support running optimizer as communication hook with
optimizers that support a per-parameter/gradient step function `step_param`.
Add parity tests as we implement more optimizers that support step_param to
ensure parity with regular optimizers.
ghstack-source-id: 134330378
Test Plan: Ci
Reviewed By: SciPioneer
Differential Revision: D29727549
fbshipit-source-id: 18977c896f12b8e478298488b298fd107affcf5f
