Use a subset of pixels when creating a margin cache.

[delucchi-cmu]

Change Description

Closes #312

Adds an argument to explicitly limit the margin generation with a subset of pixels in the primary catalog. Since this is primarily useful when debugging, the argument name reflects that.

NB: This requires changes to provenance info JSON serialization that will be included in astronomy-commons/hats#279.

Code Quality

• I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.56%. Comparing base (53b4b0f) to head (1258181).
Report is 49 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #323   +/-   ##
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  Coverage   99.56%   99.56%           
=======================================
  Files          26       26           
  Lines        1372     1379    +7     
=======================================
+ Hits         1366     1373    +7     
  Misses          6        6           

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