feat: builtin.commands (#54)

* fix: use correct path separator on windows

* fix: add utils.get_separator

* asdf

* feat: add builtin.commands

* change commands sorter

* change sorter

* change sorter

lua/telescope/utils.lua

@@ -138,4 +138,8 @@ function utils.make_default_callable(f, default_opts)
   })
 end
 
+function utils.get_separator()
+  return package.config:sub(1, 1)
+end
+
 return utils