Improve compatibility with dplyr API

[rossellhayes]

• Accept named arguments with or without preceding dots, e.g. default or .default.
• Take default into account when determining the class of output.
• Improve error messages.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.66 🎉

Comparison is base (3c4f4f3) 99.33% compared to head (c914a16) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main        #5      +/-   ##
===========================================
+ Coverage   99.33%   100.00%   +0.66%     
===========================================
  Files          11        11              
  Lines         301       346      +45     
===========================================
+ Hits          299       346      +47     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
R/fn_case.R	100.00% <100.00%> (ø)
R/in_case.R	100.00% <100.00%> (ø)
R/in_case_fct.R	100.00% <100.00%> (ø)
R/in_case_list.R	100.00% <100.00%> (ø)
R/replace.R	100.00% <100.00%> (ø)
R/staticimports.R	100.00% <100.00%> (ø)
R/switch_case.R	100.00% <100.00%> (ø)
R/utils.R	100.00% <100.00%> (ø)
R/validate_case_length.R	100.00% <100.00%> (+6.45%)	⬆️

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