[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:

• Add unit testing for frame slices (make sure offsets + conversions are handled correctly)
• Implement denoising with window:
  • Implement IntenseAtIndex (which also entails implementing a proxy 'point' struct), AsNDPointsAtIndex and NDPointConverter for slice frames.
  • Implement a SliceFrameRTWindow struct and -> AsNDPointsAtIndex + NDPointConverter for that.
  • Implement aggregator for that 'point' struct ...
  • Replace element wise denoising ->

    ionmesh/src/aggregation/ms_denoise.rs

    Lines 296 to 306 in 42854f0

    	denoise_frame_slice(
    	&x,
    	&self.ims_converter,
    	&self.mz_converter,
    	&self.dia_frame_info,
    	self.min_n,
    	self.min_intensity,
    	self.mz_scaling,
    	self.max_mz_extension,
    	self.ims_scaling,
    	self.max_ims_extension,

    with window-wise denoising.
• Chores + maintainability:
  • Rename dbscan functions.
    • _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'
• Make explicit what distances are in projected dimensions and which are not.
• Consider bundling the extra filter fun with the DistantAtIndex trait.