[ColossalChat] Update RLHF V2

[YeAnbang]

📌 Checklist before creating the PR

• [ ] I have created an issue for this PR for traceability
• [ ] The title follows the standard format: [doc/gemini/tensor/...]: A concise description
• [ ] I have added relevant tags if possible for us to better distinguish different PRs

🚨 Issue number

Link this PR to your issue with words like fixed to automatically close the linked issue upon merge

e.g. fixed #1234, closed #1234, resolved #1234

📝 What does this PR do?

Summarize your work here. if you have any plots/diagrams/screenshots/tables, please attach them here.

💥 Checklist before requesting a review

• [ ] I have linked my PR to an issue (instruction)
• [ ] My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
• [x] I have performed a self-review of my code
• [x] I have added thorough tests.
• [x] I have added docstrings for all the functions/methods I implemented

⭐️ Do you enjoy contributing to Colossal-AI?

• [ ] 🌝 Yes, I do.
• [ ] 🌚 No, I don't.

Tell us more if you don't enjoy contributing to Colossal-AI.

[TongLi3701]

Hi @YeAnbang , is this ready to review? Should I review https://github.com/hpcaitech/ColossalAI/pull/5148 this first?

[YeAnbang]

Is ready for review now. Still working on fixing the following bug:

• All script hang during booster.save_model with Gemini.

[YeAnbang]

Local CI Test Results

ci.pdf

[YeAnbang]

all tests passed locally.

[YeAnbang]

Experiment Report

SFT

DPO

PPO