WIP: optional moving_seg/fixed_seg support in VoxelMorph.forward

[Kheil-Z]

Fixes #8540 .

Description

This is a work-in-progress PR to extend VoxelMorph.forward for optional label (moving_seg, fixed_seg, keypoints) support, enabling semi-supervised deformable image registration.

Current State

No functional changes yet.

Next steps :

• Implement warping of segmentation maps using self.warp.
• Update the function signature to include optional moving_seg and fixed_seg.
• Update tests and docstrings accordingly.

Types of changes

• [] Non-breaking change (fix or new feature that would not break existing functionality).
• [ ] Breaking change (fix or new feature that would cause existing functionality to change).
• [ ] New tests added to cover the changes.
• [ ] Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• [ ] Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• [ ] In-line docstrings updated.
• [ ] Documentation updated, tested make html command in the docs/ folder.

[coderabbitai[bot]]

[!IMPORTANT]

Review skipped

Ignore keyword(s) in the title.

:no_entry: Ignored keywords (2)

• WIP
• DO NOT MERGE

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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