[pipeline] ASR pipeline kwargs are forwared to generate

[gante]

What does this PR do?

Related to #25084

Makes the ASR pipeline behave as other text-generating pipelines: kwargs at call time are forwared to generate, as opposed to needing a special keyword.

---

from transformers import pipeline
from datasets import load_dataset

model = "openai/whisper-tiny"
asr = pipeline("automatic-speech-recognition", model=model)
dataset = load_dataset("hf-internal-testing/librispeech_asr_dummy", "clean", split="validation[:1]")

# BC: with `generate_kwargs` as a dictionary
res = asr(
    dataset[0]["audio"],
    generate_kwargs={"task": "transcribe", "max_new_tokens": 256},
    chunk_length_s=30,
    batch_size=8,
)
print(res)

# New: kwargs forwarded to `generate`
res = asr(
    dataset[0]["audio"],
    max_new_tokens=256,
    task="transcribe",
    chunk_length_s=30,
    batch_size=8,
)
print(res)

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: whisper