Add PrefixSpeechLmOnnxLabelScorer#218
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…f assuming prompt length
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This PR adds a new LabelScorer which can be used for Speech LLMs. Structurally it is roughly similar to the
StateManagedOnnxLabelScorerfrom #206. The main difference is how the initial states are constructed. While theStateMangedOnnxLabelScoreronly gets one or more start labels as initial history while thePrefixSpeechLmOnnxLabelScorerhas a separate initializer ONNX model which gets aninitial-prompt,encoder-statesandsuffix-promptto produce the initial scores and states. Also, theStateManagedOnnxLabelScorerfeeds in the encoder-states at every scoring step while thePrefixSpeechLmOnnxLabelScoreronly feeds the encoder-states for the initialization.