Fix volume transformation, add observation wrapper

[carlocagnetta]

• Fix observations to MultiBoxSpace: All observations_spaces are now MultiBox
• Fix volume transformation: Was buggy when transformations were laying the volume origin in negative absolute coordinates, Solution: project the origin into positive octant
• Fix clustering: Buggy behavior when no noise cluster was present. Fixed that as well as parameters.
• New volumes src New src folder for volumes' operations
• AddRewardDetailsWrapper: Wrapper to keep memory of the best reward and action seen so far. Best reward and action are stacked at the end of every observation.
• Add tests for optimal slice
• Add more volumes
• Normalizing volumes to same spacing
• Add class for ImageVolume and TransformedVolume

[MischaPanch]

Pls also fix the failing pipeline - why do the linting tests not start?