Implement edge tessellation in import and export

[paleolimbot]

No description provided.

[codecov-commenter]

Codecov Report

Merging #182 (d0ccd3a) into main (b168197) will increase coverage by 0.29%.
The diff coverage is 98.49%.

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   93.67%   93.97%   +0.29%     
==========================================
  Files          49       46       -3     
  Lines        3509     3433      -76     
==========================================
- Hits         3287     3226      -61     
+ Misses        222      207      -15     

Impacted Files	Coverage Δ
R/wk-utils.R	96.55% <95.45%> (-3.45%)	⬇️
src/s2-constructors-formatters.cpp	95.27% <97.31%> (+0.44%)	⬆️
R/plot.R	100.00% <100.00%> (ø)
R/s2-cell-union.R	90.62% <100.00%> (ø)
R/s2-constructors-formatters.R	100.00% <100.00%> (ø)
R/s2-geography.R	98.36% <100.00%> (+0.05%)	⬆️
R/s2-transformers.R	100.00% <100.00%> (ø)
R/vctrs.R	100.00% <100.00%> (ø)
src/s2-cell.cpp	99.74% <100.00%> (ø)
src/s2-geography.cpp	100.00% <100.00%> (ø)
... and 6 more

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