feat: add benchmark

[seyeong-han]

DYLD_LIBRARY_PATH=/usr/lib ./cmake-out/examples/models/parakeet/parakeet_runner \
  --model_path examples/models/parakeet/parakeet_metal_bf16/model.pte \
  --audio_path obama_short20.wav \
  --tokenizer_path examples/models/parakeet/parakeet_metal_bf16/tokenizer.model \
  --warmup --warmup_iterations=3

[pytorch-bot]

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