[Single File] GGUF/Single File Support for HiDream

[DN6]

What does this PR do?

Adding single file support for the HiDream transformer so that it can load GGUF checkpoints.

Fixes # (issue)
#11344

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[HuggingFaceDocBuilderDev]

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[a-r-r-o-w]

Thanks, changes LGTM!