[Web] Decode packed BF16 tensor records in place - #20167
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Packed BF16 decoding currently uses separate input and output storage. Add a Wasm entry point that expands values backward in the destination buffer after the packed bytes have been copied into its lower half. Use the in-place path when the entry point is available and keep the existing decoder otherwise. Both paths account for DLTensor byte_offset.
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WIP: merge #20166 first
Reduce peak WASM memory during BF16 tensor-cache loading by decoding directly in the final
float32CPU tensor allocation. The packed BF16 input is copied into the lower half of the destination tensor and expanded backward, preventing output writes from overwriting unread input. This removes the separate FFI byte-array allocation previously required during decoding. Leave the existing decoder as a fallback when the new WASM entry point is unavailable.