CommonVoice support for `convert_hf_dataset_to_nemo` script
# What does this PR do ?

Related #5638 #5772  

Renames `sentence` column to `text` before creating manifest. Exposes `ensure_ascii` for saving the transcripts + fix naming of config class.

**Collection**: ASR

# Changelog 
- CommonVoice support for `convert_hf_dataset_to_nemo` script.

# Usage
* You can potentially add a usage example below

```bash
python scripts/speech_recognition/convert_hf_dataset_to_nemo.py \
        output_dir=/data/commonvoice/ \
        path="mozilla-foundation/common_voice_11_0" \
        name="eo" \ # esperanto
        split="validation" \
        ensure_ascii=False \
        use_auth_token=True
```

**Pre checks**:
- [x] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation