[Dreambooth] Add a function to log interim generation

[discus0434]

This pull request allows to log interim generation during Dreambooth.

Usage add an argument --generating_progress_steps <int>. The process generates an interim image per steps you choose. To be able to generate deterministically, you can also set --seed argument such as --seed 42.

Generated images are stored at f"{args.output_dir}/logs/.

This PR is almost same as #1711 . To avoid throw PR from main, I reopen this one.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[patrickvonplaten]

This should be solved by: https://github.com/huggingface/diffusers/pull/1668 no?

[github-actions[bot]]

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[patrickvonplaten]

This is actually not solved yet (cc @patil-suraj ).

Same issue was opened here: https://github.com/huggingface/diffusers/issues/1993

[patil-suraj]

Adding this to my todo list.

[patrickvonplaten]

We should add intermediate logging exactly as it's done here for textual inversion actually: https://github.com/huggingface/diffusers/pull/2178#pullrequestreview-1298450036

[patrickvonplaten]

cc @yiyixuxu would you like to give this a try?