Cleanup of BatchedInferencePipeline

[MahmoudAshraf97]

This PR aims to further refine BatchedInferencePipeline class to include more transcription options and other improvements

Summary:

• Supported new options for batched transcriptions:
  • temperature
  • hotwords
  • fixed initial prompt
• moved generate_segment_batched function from WhisperModel to BatchedInferencePipeline
• make the pipeline class stateless
• clarified documentation about what arguments do not have an effect in batched transcription

[carolinaxxxxx]

@MahmoudAshraf97 i check git+https://github.com/MahmoudAshraf97/faster-whisper.git@add_hotwords_batched and get error:

".../faster_whisper/transcribe.py", in line 487, in transcribe
if not self.model.is_multilingual and language != "en":
AttributeError: 'WhisperModel' object has no attribute 'is_multilingual'

[MahmoudAshraf97]

fixed

[carolinaxxxxx]

@MahmoudAshraf97 i got another error after update:

"...faster_whisper/transcribe.py", line 545, in transcribe
all_language_probs=all_language_probs,
UnboundLocalError: local variable 'all_language_probs' referenced before assignment

[MahmoudAshraf97]

@MahmoudAshraf97 i got another error after update:

"...faster_whisper/transcribe.py", line 545, in transcribe
all_language_probs=all_language_probs,
UnboundLocalError: local variable 'all_language_probs' referenced before assignment

Should be fixed