Debug arclength_sampling

[Sichao25]

arclength_sampling uniformly samples data points on an arc curve that is generated from vector field predictions. However, it may terminate earlier than expected, resulting in inconsistent shapes in the output.

Proposed solution: When the length of output is smaller than expected, calculate a new point with the last set of parameters.

[codecov-commenter]

Codecov Report

Merging #586 (ddb3077) into master (153f5b7) will decrease coverage by 0.01%.
The diff coverage is 5.88%.

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@@            Coverage Diff             @@
##           master     #586      +/-   ##
==========================================
- Coverage   22.32%   22.32%   -0.01%     
==========================================
  Files         158      158              
  Lines       26356    26362       +6     
==========================================
  Hits         5885     5885              
- Misses      20471    20477       +6     

Files	Coverage Δ
dynamo/prediction/state_graph.py	12.42% <0.00%> (ø)
dynamo/prediction/utils.py	7.69% <6.25%> (-0.13%)	⬇️

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