update HeatmapGridDensity and testing

[dehann]

No description provided.

[codecov]

Codecov Report

Merging #1440 (af779ff) into master (74affb9) will increase coverage by 0.01%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master    #1440      +/-   ##
==========================================
+ Coverage   77.18%   77.20%   +0.01%     
==========================================
  Files          67       67              
  Lines        4940     4948       +8     
==========================================
+ Hits         3813     3820       +7     
- Misses       1127     1128       +1     

Impacted Files	Coverage Δ
src/services/HeatmapSampler.jl	98.03% <87.50%> (-1.97%)	⬇️

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