Enable import/export in S2-native xyz coords

[paleolimbot]

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[codecov-commenter]

Codecov Report

Merging #185 (057c026) into main (5e16858) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   94.01%   94.11%   +0.09%     
==========================================
  Files          46       46              
  Lines        3443     3499      +56     
==========================================
+ Hits         3237     3293      +56     
  Misses        206      206              

Impacted Files	Coverage Δ
R/wk-utils.R	100.00% <100.00%> (ø)
src/s2-constructors-formatters.cpp	95.72% <100.00%> (+0.44%)	⬆️
src/s2geography/constructor.h	91.66% <100.00%> (+0.70%)	⬆️

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