[NPUW] Add Eagle3 (top-1) pipeline support with new I/O #32494
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Details:
This PR introduces support for Eagle3 (top-1) speculative decoding in the NPUW. The main changes include:
llm_eagle3_extensionmodule to handle Eagle3-specific input/output logic, including model role detection (Draft/Target), input padding, and chunked processing.LLMInferRequestto automatically detect Eagle3 models and manage Eagle3 input/output tensors during prefill and generate stages.These changes enable integration of Eagle3 (top-1) speculative decoding models with the NPU plugin.
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