Allow functions called as object names

[radbasa]

Issue #124

Description

• box_unused_att_pkg_fun_linter() now sees functions called as objects without ().

Definition of Done

• The change is thoroughly documented.
• The CI passes (R CMD check, linter, unit tests, spelling).
• Any generated files have been updated (e.g. .Rd files with roxygen2::roxygenise())

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.21%. Comparing base (6254499) to head (bfe839a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   97.20%   97.21%           
=======================================
  Files          23       23           
  Lines        1111     1112    +1     
=======================================
+ Hits         1080     1081    +1     
  Misses         31       31           

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