AlgDot and AlgStruct fields use symbols

[kris-brown]

Addresses #138

Perhaps due to julia version bump, some unrelated tests in MetaUtils stopped passing (looks like Julia is better at grabbing LineNumberNodes) so those tests were slightly changed to strip more LineNumberNodes before comparing equality.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.66%. Comparing base (1ee1536) to head (e1ea961).
⚠️ Report is 45 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   96.61%   96.66%   +0.04%     
==========================================
  Files          38       38              
  Lines        2067     2067              
==========================================
+ Hits         1997     1998       +1     
+ Misses         70       69       -1     

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