chore: use plenary.strings and remove strings functions from utils (#690)

Co-authored-by: Simon Hauser <Simon-Hauser@outlook.de>

lua/telescope/config.lua

@@ -1,3 +1,5 @@
+local strings = require('plenary.strings')
+
 -- Keep the values around between reloads
 _TelescopeConfigurationValues = _TelescopeConfigurationValues or {}
 _TelescopeConfigurationPickers = _TelescopeConfigurationPickers or {}
@@ -13,30 +15,6 @@ local function first_non_null(...)
   end
 end
 
-local dedent = function(str, leave_indent)
-  -- find minimum common indent across lines
-  local indent = nil
-  for line in str:gmatch('[^\n]+') do
-    local line_indent = line:match('^%s+') or ''
-    if indent == nil or #line_indent < #indent then
-      indent = line_indent
-    end
-  end
-  if indent == nil or #indent == 0 then
-    -- no minimum common indent
-    return str
-  end
-  local left_indent = (' '):rep(leave_indent or 0)
-  -- create a pattern for the indent
-  indent = indent:gsub('%s', '[ \t]')
-  -- strip it from the first line
-  str = str:gsub('^'..indent, left_indent)
-  -- strip it from the remaining lines
-  str = str:gsub('[\n]'..indent, '\n' .. left_indent)
-  return str
-end
-
-
 local sorters = require('telescope.sorters')
 
 -- TODO: Add other major configuration points here.
@@ -69,7 +47,7 @@ function config.set_defaults(defaults)
 
     config.values[name] = get(name, default_val)
     if description then
-      config.descriptions[name] = dedent(description)
+      config.descriptions[name] = strings.dedent(description)
     end
   end