ciflow/trunk/199610: [T273452478] Cache FBGEMM embedding kernel handles (#199610)

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Summary: Pull Request resolved: #199610 Adds separate thread-local single-entry caches for dense and row-wise-sparse FBGEMM embedding kernels, keyed by D and has_weight . Steady-state calls reuse the handle while key changes regenerate through the existing path. One entry per template instantiation intentionally bounds thread-local state and optimizes stable shapes; alternating keys regenerate. FBGEMM dispatch overr…

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