detect functional lambdas in object_usage_linter

[MichaelChirico]

Closes #1933

[codecov-commenter]

Codecov Report

Merging #1934 (0424901) into main (01500d8) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 0424901 differs from pull request most recent head 3caa643. Consider uploading reports for the commit 3caa643 to get more accurate results

@@           Coverage Diff           @@
##             main    #1934   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files         113      113           
  Lines        4939     4939           
=======================================
  Hits         4883     4883           
  Misses         56       56           

Impacted Files	Coverage Δ
R/object_usage_linter.R	99.39% <100.00%> (ø)

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[MichaelChirico]

Test failure looks spurious / caused by upstream

[IndrajeetPatil]

Thanks!