[mps] Add cshim for torchao mps ops

[angelayi]

Stack from ghstack (oldest at bottom):

• test #2501
• -> [mps] Add cshim for torchao mps ops #2485
• [mps] Add offsets to enable aoti #2484

This allows AOTI to directly call the custom ops rather than using the proxy executor.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2485

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 5177711 with merge base 61d49d4 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run TorchAO Experimental Tests / test-mps-ops (macos-m1-stable) (gh) (trunk failure)
  Process completed with exit code 127.

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