feat: Auto-find dims and coords on arrays that support it

[tlambert03]

We have a sort of "implicit" xarray-API mirror going on here, where array objects can inform us about the dimension names and coordinates using dims and coords, but that's only actually working for literal xarray objects. This hoists that logic up to the base class, so that any ArrayLike object that has dims can label the dimensions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.05%. Comparing base (1237487) to head (2aad6df).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
- Coverage   86.10%   86.05%   -0.05%     
==========================================
  Files          46       46              
  Lines        5209     5208       -1     
==========================================
- Hits         4485     4482       -3     
- Misses        724      726       +2     

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