Support for LLaMa-type models?
**Is your feature request related to a problem? Please describe.**

With the recent PR adding support for the MPT-7b model, I was wondering if someone has figured out how to work with LLaMa-type models, such as Vicuna

**Describe the solution you'd like**

A solution similar to this PR for LLaMa-type models 
https://github.com/NVIDIA/NeMo/pull/6804

**Describe alternatives you've considered**

Triton/FasterTransformer can now support LLaMa so hopefully this is possible for Nemo

**Additional context**

Huggingface Transformers also supports LLaMa-architecture
https://huggingface.co/docs/transformers/main/model_doc/llama