Add support for instruct models in nemo 2
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**Is your feature request related to a problem? Please describe.**

I mostly work with instruct models, and most of the recipes are focused on base models. This is particularly prominent in the sequence packing, which doesn't account for instruct templates in the sequence.

**Describe the solution you'd like**

Examples of performing PEFT, with and without sequence packing on llama 3.1 8b instruct would be helpful.

**Describe alternatives you've considered**

Right now we've patched nemo 1 to work with this.

