Add ggplot.layer_data to the public API

[has2k1]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.82%. Comparing base (68b000a) to head (d0ae2f9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1038   +/-   ##
=======================================
  Coverage   86.82%   86.82%           
=======================================
  Files         202      202           
  Lines       13783    13787    +4     
  Branches     1701     1701           
=======================================
+ Hits        11967    11971    +4     
  Misses       1270     1270           
  Partials      546      546           

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