Adding method to check IDs

Fixes #1001.

Added a method, CombinedObjectReader.check_aux_object_ids(), that uses existing code to check that the ObjIDs in the auxiliary input files are an exact match for each other.
If the files do not contain exactly the same ObjIDs, an error is thrown and the code stops.
This check is performed only ONCE per Sorcha run, and takes 1.4s on input files of 10k lines.
Wrote a unit test.

Meg: this isn't the way we discussed implementing it. I think it's better. Feel free to disagree :)

Dataframes aren't merged until chunking has begun. If we check dataframe size on merge, there's a possibility that the user could get to chunk 999 of 1000 and THEN have the code fail because the ObjIDs don't match. This would be very annoying.

This method checks once, using code Jeremy already wrote, and takes 1.4s on 10k-row input files. I think it's worth it.

Review Checklist for Source Code Changes

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

dirac-institute / sorcha

Adding method to check IDs #1025

Review Checklist for Source Code Changes

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