Speed up image processing

[tathey1]

Accelerate fragment generation process and computation of the tiered image for likelihood costs.

[codecov[bot]]

Codecov Report

Merging #317 (f694f86) into develop (083b4e4) will increase coverage by 0.38%. The diff coverage is 95.52%.

@@             Coverage Diff             @@
##           develop     #317      +/-   ##
===========================================
+ Coverage    57.78%   58.17%   +0.38%     
===========================================
  Files           48       49       +1     
  Lines         4532     4571      +39     
===========================================
+ Hits          2619     2659      +40     
+ Misses        1913     1912       -1     

Impacted Files	Coverage Δ
brainlit/preprocessing/image_process.py	98.93% <92.00%> (+1.08%)	:arrow_up:
...t/algorithms/connect_fragments/trace_evaluation.py	96.87% <96.87%> (ø)
brainlit/algorithms/connect_fragments/__init__.py	100.00% <100.00%> (ø)
.../connect_fragments/dynamic_programming_viterbi2.py	86.06% <100.00%> (+0.17%)	:arrow_up: