Add DAPT tutorial

[jihyeonRyu]

What does this PR do ?

Add a tutorial for DAPT training using ChipNeMo, provided as a step-by-step guide split into three stages, making it easy for users to follow along with interactive .ipynb notebooks.

Collection: [Note which collection this PR will affect]

Changelog

Added four .ipynb tutorial files under /tutorials/llm/llama-3/dapt to guide users through the DAPT training process.

• Step 0: Create Dummy Data
• Step 1: DAPT
• Step 2: Alignment
• Step 3: Domain Adapted Retrieval

Usage

You can follow the step-by-step tutorial by navigating to /tutorials/llm/llama-3/dapt and running the provided .ipynb notebooks.

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• Bugfix
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