feat!: Multi-image selection in Python and AI plugins

[SilviaZeta]

Description

Change the parameter imageUid of type string, which is passed to Python and AI plugins in the request body, to imageUids of type string[], so multiple images can be used with plugins.

Although ANNOTATE works with single images, this change is applied here for consistency with CURATE plugins.

Checklist:

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• [ ] I have read the gliff.ai Contribution Guide.
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• [ ] I have checked all commit message styles match the requested structure.
• [ ] My code follows the style guidelines of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] I have performed a self-review of my own code.
• [ ] I have assigned 3 or less reviewers.
• [ ] New and existing unit tests pass locally with my changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] My changes generate no new warnings.
• [ ] I have made corresponding changes to the documentation.
• [ ] New database changes have been committed.
• [ ] If appropriate, I have bumped any version numbers.

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