refactor(model): Refactor model repo

[boat1603]

Why this PR

Why we need this PR? This PR is about refactor model repo in OpenThaiGPT

Changes

• Just refactor repo no logical change.

Related Issues

Close #

Checklist

• [x] PR should be in the Naming convention
• [ ] Assign yourself in to Assigneees
• [ ] Tag related issues
• [ ] Constants name should be ALL_CAPITAL, function name should be snake_case, and class name should be CamelCase
• [ ] complex function/algorithm should have Docstring
• [x] 1 PR should not have more than 200 lines changes (Exception for test files). If more than that please open multiple PRs
• [x] At least PR reviewer must come from the task's team (model, eval, data)