ciflow/inductor/199800: [input_capture] Add an AOTAutograd compiled-graph hook (#199800)
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What happened
Summary: Add an optional AOTAutograd callback that can wrap each freshly compiled forward, inference, or backward callable. The callback is invoked at the forward/inference compiler, eager backward compiler, and lazy backward compiler sites. When unset, each path returns the original callable unchanged. Fbcode registers real input capture once through a guarded import, while OSS behavior remains unchanged. This prov…
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