Capture parser warnings as lints

[MichaelChirico]

Closes #2065

[codecov]

Codecov Report

Attention: Patch coverage is 98.64865% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.63%. Comparing base (f41313d) to head (2047bd3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
R/lint.R	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2792      +/-   ##
==========================================
- Coverage   99.65%   99.63%   -0.02%     
==========================================
  Files         126      126              
  Lines        6898     6935      +37     
==========================================
+ Hits         6874     6910      +36     
- Misses         24       25       +1     

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