When generating WCSes, set NAXIS/array_shape/etc.

[svank]

PR summary

Ran into this when testing a remove_starfield speedup---generated WCSes don't have their NAXISN keywords set, and therefore don't have pixel_shape or array_shape. On the remove_starfield side that can and should and now is handled. But this seems like a might-as-well-have on the punchbowl side.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.32%. Comparing base (79c49dc) to head (5afc7c5).
Report is 112 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #320   +/-   ##
=======================================
  Coverage   88.31%   88.32%           
=======================================
  Files          56       56           
  Lines        3740     3742    +2     
=======================================
+ Hits         3303     3305    +2     
  Misses        437      437           

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[jmbhughes]

There are more spots in punchbowl this matters, so I'll open an issue.