Added rownum to `TableLoader.__init__`

[hepcat72]

Summary Change Description

Note, this is implemented in another branch, but I did it here just because we needed it.

Only tested manually with:

python manage.py load_msruns --mzxml-files blah.mzXML --operator "MichaelNienast" --date 2024-05-30 --lc-protocol-name polar-HILIC-25-min --instrument QE

Affected Issues/Pull Requests

• (temporarily) Resolves #977

Review Notes

See comments in-line.

Checklist

This pull request will be merged once the following requirements are met. The author and/or reviewers should uncheck any unmet requirements:

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  • [x] New/changed method tests implemented/updated (or no change)
  • [ ] Updated Unreleased section of changelog.md (or no change)
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