[WIP] Feature/sliding window denoising

[jspaezp]

This PR actually bundles several things ...

1. Refactors a lot of the aggregation/denoising/dbscan logic.
2. Removes unused compiler flags
3. Changes the order in which frames are aggregated (split+aggregated in groups by isolation window before denoising, not during)

[jspaezp]

TODO:

• [x] Add unit testing for frame slices (make sure offsets + conversions are handled correctly)
• Implement denoising with window:
  • [x] Implement IntenseAtIndex (which also entails implementing a proxy 'point' struct), AsNDPointsAtIndex and NDPointConverter for slice frames.
  • [x] Implement a SliceFrameRTWindow struct and -> AsNDPointsAtIndex + NDPointConverter for that.
  • [x] Implement aggregator for that 'point' struct ...
  • [x] Replace element wise denoising -> https://github.com/TalusBio/ionmesh/blob/42854f05ee6bb008019286bedbaeb3225c8272c6/src/aggregation/ms_denoise.rs#L296-L306 with window-wise denoising.
• Chores + maintainability:
  • [ ] Rename dbscan functions.
    • [x] _dbscan -> dbscan_label_clusters?
    • [ ] dbscan_generic -> IndexAndDbscanAggregate ? ... maybe split it as a Runner with .convert + .index + .label + .aggregate + .refine
• [ ] Revise the generic annotations + param names for dbscan to more sensible 'names'
• [x] Make explicit what distances are in projected dimensions and which are not.
• [ ] Consider bundling the extra filter fun with the DistantAtIndex trait.