Remove adamw implementation variants: adamw_mf and adamw_zero1

[SamitHuang]

What does this PR do?

Related to #1300

Remove for cleaner code since adamw_mf and adamw_zero1 are not used anymore.

This PR also removes stable diffusion xl which uses adamw_zero1, we are not going to maintain this model in master branch since it's out of date. For users who want to access it, they can either 1) use v0.2.0 branch, 2) use the new diffusers implementations referring to examples/diffusers/text_to_image/train_text_to_image_sdxl.py. Remove dynamicrafter, ip adapter, svd, sv3d, and t2i_adapter under examples for similar reasons.

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

@vigo999 @zhanghuiyao @CaitinZhao

[gemini-code-assist]

Summary of Changes

Hello @SamitHuang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on refining the project's structure and dependencies by eliminating deprecated optimizer implementations and an outdated model example. The changes aim to simplify maintenance and guide users towards current and actively supported features within the repository.

Highlights

• Code Cleanup: Removed unused adamw_mf and adamw_zero1 optimizer variants to streamline the codebase.
• Model Example Removal: The stable_diffusion_xl example, along with its associated configurations, demos, and documentation, has been removed as it is no longer maintained in the master branch. Users are directed to v0.2.0 or new diffusers implementations.

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[gemini-code-assist]

Code Review

This pull request performs a significant code cleanup by removing the entire stable_diffusion_xl example, which is no longer maintained. The removal includes unused AdamW optimizer variants (adamw_mf and adamw_zero1) and all associated configuration, documentation, and source files. This change is a positive step towards improving code health and reducing maintenance burden. The deletions are extensive but appear to be consistent with the goal of removing an outdated feature. The PR is well-documented and the changes are clear.

[zhtmike]

dynacrafter / ip adapter / svd / sv3d / t2i_adapter relies on stable diffsion xl, might need modify / delete as well