added Lhotse online augmentation tutorial for SE and fixed problem wi…

[nasretdinovr]

…th online RIR augmentation

What does this PR do ?

Aim of this PR is to push a tutorial of training speech enhancement models with online augmentation to NeMo.

Collection: audio

Changelog

• New notebook file with the tutorial added to tutorials/audio/speech_enhancement
• New configuration file for the training "masking" model with online augmentation added to the examples/audio/conf/
• Problem with the RIR online augmentation is fixed in nemo/collections/audio/data/audio_to_audio_lhotse.py

Usage

All instructions are in the notebook examples/audio/conf/masking_with_online_augmentation.yaml

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• New Feature
• Bugfix
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Additional Information

• Related to # (issue)