feat: support CPU thread count in C, Python, and Swift EmbeddingEngine - #3550
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- Expose `litert_lm_embedding_engine_settings_set_num_threads` in the C API. - Forward `backend=interfaces.CPU(thread_count=N)` in Python EmbeddingEngine. - Pass `backend = .cpu(threadCount: N)` in Swift EmbeddingEngine. LiteRT-LM-PiperOrigin-RevId: 979300636
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feat: support CPU thread count in C, Python, and Swift EmbeddingEngine
litert_lm_embedding_engine_settings_set_num_threadsin the C API.backend=interfaces.CPU(thread_count=N)in Python EmbeddingEngine.backend = .cpu(threadCount: N)in Swift EmbeddingEngine.