Add option to scale composed layers according to voxel size

[Tobias314]

When composing a dataset from datasets with differing voxel sizes, the new dataset now uses the finest of them. WEBKNOSSOS already respects the physical sizes exactly by rebasing the layers' mags whenever the voxel size ratios are powers of two, so the new "Respect voxel size" option is only offered when that is impossible and scaling transforms are the only remaining way to keep the physical sizes.

Summary

Steps to test:

• abc

Issues:

• fixes #

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(Please delete unneeded items, merge only when none are left open)

• Added changelog entry (create a $PR_NUMBER.md file in unreleased_changes or use ./tools/create-changelog-entry.py)
• Added migration guide entry if applicable (edit the same file as for the changelog)
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

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