fix: improve mesh data loading

[numb3r3]

deduplicated() would throw divide by zero error in some cases.

[codecov]

Codecov Report

Merging #25 (4f54c64) into main (e62c1ad) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   82.84%   82.93%   +0.08%     
==========================================
  Files          67       67              
  Lines        3137     3135       -2     
==========================================
+ Hits         2599     2600       +1     
+ Misses        538      535       -3     

Flag	Coverage Δ
docarray	82.93% <100.00%> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
docarray/document/mixins/mesh.py	93.33% <100.00%> (+16.86%)	⬆️

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