Parallel chunking feature for RNNT and TDT models

[nune-tadevosyan]

What does this PR do ?

Adds support for parallel chunking for all types of ASR models

Collection: [Note which collection this PR will affect]

Changelog

• Added token_ids in the timestamps given by RNNT and TDT models.
• Provide token_sequence in CTC models to have matching tokens between timestamps and text tokens
• Provided chunking functionality for LhotseSpeechToTextBpeDataset
• Change in TranscriptionMixin to have general support for chunking.
• Tensor / numpy array support for chunking.

Usage

• You can potentially add a usage example below

import nemo.collections.asr as nemo_asr
asr_model = nemo_asr.models.ASRModel.from_pretrained("nvidia/parakeet-tdt-0.6b-v2")
transcript = asr_model.transcribe(["path/to/audio_file.wav"], enable_chunking=True)[0].text

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• New Feature
• Bugfix
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Additional Information

• Related to # (issue)