make lazy loading better...

- add a ft function to make it better when trying to load a plugin on a
  ft
- add shorthands to make it easier to create one load condition

lua/lazy/utils.lua

@@ -46,7 +46,7 @@ function lazy:cmd(name, opts)
   table.insert(self.command_ids, name)
 end
 
---- user an auto command which will trigger the plugin to load
+--- create an auto command which will trigger the plugin to load
 ---@param event string the event to trigger on
 ---@param opts vim.api.keyset.create_autocmd? options
 function lazy:auto(event, opts)
@@ -60,6 +60,14 @@ function lazy:auto(event, opts)
   table.insert(self.auto_ids, vim.api.nvim_create_autocmd(event, opts))
 end
 
+--- create an auto command which will trigger on filetype
+---@param filetype string filetype to register the auto on
+function lazy:ft(filetype)
+  lazy:auto("FileType", {
+    pattern = filetype
+  })
+end
+
 --- create a keybind which will trigger the plugin to load
 ---@param mode string the mode to trigger in
 ---@param bind string the binding to use