Update neighbors

[Sichao25]

• Add new nearest neighbors methods
• Reuse existing functions to avoid duplicate code

[codecov-commenter]

Codecov Report

Merging #552 (aa36f2d) into master (583d2f1) will increase coverage by 0.07%.
The diff coverage is 36.63%.

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@@            Coverage Diff             @@
##           master     #552      +/-   ##
==========================================
+ Coverage   22.69%   22.77%   +0.07%     
==========================================
  Files         160      160              
  Lines       26551    26516      -35     
==========================================
+ Hits         6026     6039      +13     
+ Misses      20525    20477      -48     

Files	Coverage Δ
dynamo/tools/utils.py	33.30% <ø> (+0.36%)	⬆️
dynamo/tools/graph_calculus.py	19.55% <50.00%> (+0.25%)	⬆️
dynamo/tools/growth.py	15.78% <50.00%> (+2.20%)	⬆️
dynamo/tools/metric_velocity.py	12.14% <0.00%> (+0.49%)	⬆️
dynamo/tools/sampling.py	24.76% <50.00%> (+2.03%)	⬆️
dynamo/vectorfield/clustering.py	8.09% <50.00%> (+0.61%)	⬆️
dynamo/vectorfield/scVectorField.py	36.05% <66.66%> (+0.31%)	⬆️
dynamo/vectorfield/stochastic_process.py	17.77% <50.00%> (+1.11%)	⬆️
dynamo/vectorfield/topography.py	22.00% <50.00%> (+0.41%)	⬆️
dynamo/tools/Markov.py	19.66% <40.00%> (+0.14%)	⬆️
... and 2 more

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