feat: make Axis public

[tlambert03]

closes #199

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.80%. Comparing base (569c207) to head (4dabd9b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
+ Coverage   93.78%   93.80%   +0.02%     
==========================================
  Files          18       18              
  Lines        1239     1243       +4     
==========================================
+ Hits         1162     1166       +4     
  Misses         77       77              

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