Spot Refactor: LocalSearchBlobDetector

[shanaxel42]

Both STARmap and current Seqfish currently use LocalSearchBlobDetector. This refactor eliminates the need for a separate LocalSearchBlobDetector class and instead both assays now use the regular BlobDetector and the PerRoundMaxChannel with a trace building strategy of 'nearest neighbors'. A lot of the changes here are mostly just moving code that already existed in LocalSearchBlobDetector and a few changes to make BlobDetector work for both ISS and STARmap.

[codecov-io]

Codecov Report

Merging #1577 into saxelrod-remove-old-blob will increase coverage by 0.16%.
The diff coverage is 100%.

@@                     Coverage Diff                      @@
##           saxelrod-remove-old-blob    #1577      +/-   ##
============================================================
+ Coverage                     88.06%   88.22%   +0.16%     
============================================================
  Files                           148      149       +1     
  Lines                          5169     5240      +71     
============================================================
+ Hits                           4552     4623      +71     
  Misses                          617      617

Impacted Files	Coverage Δ
starfish/types.py	100% <ø> (ø)	⬆️
starfish/core/types/__init__.py	100% <ø> (ø)	⬆️
starfish/core/spots/DecodeSpots/trace_builders.py	100% <100%> (ø)	⬆️
starfish/core/types/_constants.py	98.21% <100%> (+0.1%)	⬆️
...re/spots/DetectSpots/local_search_blob_detector.py	95.23% <100%> (+0.04%)	⬆️
starfish/core/types/_spot_finding_results.py	93.93% <100%> (+0.39%)	⬆️
...spots/DecodeSpots/per_round_max_channel_decoder.py	100% <100%> (ø)	⬆️
starfish/core/spots/DecodeSpots/util.py	100% <100%> (ø)
starfish/core/spots/FindSpots/blob.py	95.91% <100%> (+0.36%)	⬆️

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