Add support for finetuning with huggingface datasets
# What does this PR do ?

Add support for finetuning with HuggingFace datasets.


**Collection**: [ASR]

# Changelog 
- Add dataset wrappers that cast HuggingFace dataset to be compatible with NeMo ASR models.
- Add yaml for finetuning ASR models with HuggingFace datasets.

# Usage

```python
<NEMO_ROOT>/examples/asr/speech_to_text_finetune.py \
    --config-name='speech_to_text_hf_finetune'
```

Please refer to `speech_to_text_hf_finetune.yaml` for how to configure the dataset to use.

# Before your PR is "Ready for review"
**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**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation
