Big speedup for ObjID checking

[astronomerritt]

Fixes #1040.

• Changed the way the ObjID columns in auxiliary input files are checked against each other in CombinedDataReader.check_aux_object_ids().
• Tweaked error handling a bit so it worked properly again.

Initially I implemented this in the silliest way possible, by checking each individual element in one ObjID list to make sure it exists in the other list. This is O(n^2) complexity -- runtime scales quadratically with the size of the data -- and I should have known better. I plead temporary insanity.

It's now using collections.Counter() to compare one list's count of unique elements to the other. This is O(n) so runtime scales linearly with data size.

On an input file of 250,000 rows it takes 150ms.

(Not twelve minutes.)

Review Checklist for Source Code Changes

• Does pip install still work?
• Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• Does Sorcha run successfully on a test set of input files/databases?
• Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.17%. Comparing base (bbece40) to head (844dc1d).
Report is 315 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1042      +/-   ##
==========================================
+ Coverage   81.14%   81.17%   +0.02%     
==========================================
  Files          70       70              
  Lines        3166     3171       +5     
==========================================
+ Hits         2569     2574       +5     
  Misses        597      597              

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