[Feature Request]: Add LLM template

**Description**

The project template ideally needs to be able to process unstructured, structured and imaging data. There is currently support for imaging data as well as a script that leverages encoder-based transformers (BERT style) for multiclass/multilabel classification.

The repository would benefit from a script that leverages decoder-based transformers (GPT style) for various clinical tasks (information extraction, summarisation, clinical decision making etc).

*Brief description of the new feature*

Scripts inspired from the NLP Head and Neck workshop for information extraction.

**Why do you need the new feature?**

GPT style LLMs are useful when very little annotated data is available and can be used to teach smaller more runnable models.

**How are you going to use this new feature?**

For any NLP clinical task (IE, NER, classification etc)

**Solution suggestion**

Scripts inspired from the NLP Head and Neck workshop for information extraction.

*Suggestion of how this could be implmented*