Synthetic-data dense depth fitter tests

[Algomorph]

Note: variable node coverage == minimum--neighbor-distance-based node coverage

• [x] Fixed node coverage - 1 plane/node -translation-only
• [x] Fixed node coverage - 1 plane/node - rotation-only
• [x] Fixed node coverage - 1 plane/node - rotation and translation
• [ ] Fixed node coverage - 2 plane/node - translation only
• [ ] Fixed node coverage - 2 plane/node - rotation only
• [x] Fixed node coverage - 2 plane/node - rotation and translation
• [ ] Variable node coverage - 2 plane/node - rotation only
• [ ] Variable node coverage - 2 plane/node - translation only
• [ ] Variable node coverage - 2 plane/node - rotation and translation
• [ ] Fixed node coverage - 2-node surface - translation only
• [ ] Fixed node coverage - 2-node surface - rotation only
• [ ] Fixed node coverage - 2-node surface - rotation and translation