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[Executorch][sdpa] Refactor sdpa into impl and op (#9909)

Mostly preparing for adding quantized sdpa

Differential Revision: [D71370596](https://our.internmc.facebook.com/intern/diff/D71370596/)

ghstack-source-id: 276012277
Pull Request resolved: #9886
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pytorchbot committed
bd98b5e2b7939d9e6f3f6dd75e5bde6a23a6db02
Parent: dd9746e
Committed by GitHub <noreply@github.com> on 4/4/2025, 4:48:53 PM