(nut) add buf.filetype_icon

[MunifTanjim]

resolves #77

Example Usage

stl:add_item({
  hl = { bg = color.bg1 },
  prefix = " ",
  content = {
    nut.buf.filetype_icon({ suffix = " " }),
    nut.buf.filetype({}),
  },
  suffix = " ",
})

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6024f75) 100.00% compared to head (3db9e3b) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #79   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        38    +1     
  Lines         2530      2550   +20     
=========================================
+ Hits          2530      2550   +20     

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