[v1.2][ISSUE-374] deltatuner denas-ssf multiple model validation and model merge

[zhouyu5]

What changes were proposed in this pull request?

• refine the code to support multi LLM models for ssf, and update the readme
• refactor the code to support easy-to-use model merge utility for ssf

Why are the changes needed?

• To prove the deltatuner's compatible with multiple models
• To improve the user experience

How was this patch tested?

deltatuner ci/cd has covered this PR's change

[github-actions]

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[zhouyu5]

@XinyaoWa @tianyil1 Please review this PR. Feel free to leave your comments.

[tianyil1]

Left come comments below.

[tianyil1]

LGTM

[zhouyu5]

@xuechendi Please have a check. It is now ready to merge.

[xuechendi]

LGTM

[xuechendi]

@zhouyu5 , I will merge this PR. BTW, reading through comments, I think there are some design changes happened, can you also wrap up a design doc or point me existing design doc, so I can understand the workflow and class diagram from there?

[zhouyu5]

@zhouyu5 , I will merge this PR. BTW, reading through comments, I think there are some design changes happened, can you also wrap up a design doc or point me existing design doc, so I can understand the workflow and class diagram from there?

Actually, the API keep unchanged, just some small internal changes. We don't have a design doc yet, but we will begin to prepare a design doc. Please stay tuned.