Implement 2D decomposition with GeometryBasics

[blegat]

That should allow 2D polyhedra to be plotted with Makie and MeshCat

[codecov]

Codecov Report

Merging #274 (ef79928) into master (913d7ef) will increase coverage by 0.03%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   87.93%   87.96%   +0.03%     
==========================================
  Files          37       37              
  Lines        2867     2876       +9     
==========================================
+ Hits         2521     2530       +9     
  Misses        346      346              

Impacted Files	Coverage Δ
src/decompose.jl	76.51% <64.28%> (+1.71%)	⬆️

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