Elsevier prep.20240417

[seasidesparrow]

• Unit test cleanup + additional tests
• Adjustments to Elsevier parsing for mathml handling, nested author-group and affil handling

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.23529% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 90.58%. Comparing base (ca0a121) to head (06d2394). Report is 1 commits behind head on main.

Files	Patch %	Lines
adsingestp/parsers/elsevier.py	88.23%	10 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #103 +/- ## ========================================== + Coverage 90.44% 90.58% +0.13% ========================================== Files 25 25 Lines 2627 2687 +60 ========================================== + Hits 2376 2434 +58 - Misses 251 253 +2 ```

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[mugdhapolimera]

Feel free to merge at your convenience