Added P&C lexical audio model
# What does this PR do ?

Add audio and lexical model to NeMo and necessary support.

**Collection**:  nlp
# Changelog 
- Added `PunctuationCapitalizationLexicalAudioModel` which is inherited from `PunctuationCapitalizationModel`.
- Extended `BertPunctuationCapitalizationDataset` and `BertPunctuationCapitalizationTarredDataset` to support audio as well.
- Added default configs stored in `examples/nlp/token_classification/conf/punctuation_capitalization_lexical_audio_config.yaml`.
- Added script to run train and evaluate at `examples/nlp/token_classification/punctuation_capitalization_lexical_audio_train_evaluate.py`.

# Usage
```
python punctuation_capitalization_lexical_audio_train_evaluate.py \
        model.train_ds.ds_item=<PATH/TO/TRAIN/DATA> \
        model.train_ds.text_file=<NAME_OF_TRAIN_INPUT_TEXT_FILE> \
        model.train_ds.labels_file=<NAME_OF_TRAIN_LABELS_FILE> \
        model.validation_ds.ds_item=<PATH/TO/DEV/DATA> \
        model.validation_ds.text_file=<NAME_OF_DEV_INPUT_TEXT_FILE> \
        model.validation_ds.labels_file=<NAME_OF_DEV_LABELS_FILE
```

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**PR Type**:
- [X] New Feature
- [ ] Bugfix
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# Additional Information
* Related to # (issue)
