WIP calculate surface area of segments

[fm3]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs:

• Fix Infinity/NaN
• Validate math/output value against meshlab
• move to segment statistics route
• also allow for adhoc/volume/proofreading?
• Frontend
  • Add surface area segment statistic
  • Move segment statistic out of toplevel rightclick menu to save computation
  • Select correct combination of meshing parameters for the new route
• Wait for Use datastore segment index when loading ad-hoc meshes #8922 to enable static layer ad-hoc without seedPosition
• Re-Test proofreading ad-hoc, do we need to set editableMappingTracingId or is the layer doing this for us already?

Issues:

• fixes Surface area for segments #8610

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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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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch mesh-surface-area

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