rm un-needed lazyload function

lua/core/utils.lua

@@ -155,4 +155,31 @@ M.packer_sync = function(...)
   end
 end
 
+M.lazy_load = function(plugin)
+  vim.api.nvim_create_autocmd({ "BufRead", "BufWinEnter", "BufNewFile" }, {
+    group = vim.api.nvim_create_augroup("BeLazyOnFileOpen" .. plugin, {}),
+    callback = function()
+      local file = vim.fn.expand "%"
+      local condition = file ~= "NvimTree_1" and file ~= "[packer]" and file ~= ""
+
+      if condition then
+        vim.api.nvim_del_augroup_by_name("BeLazyOnFileOpen" .. plugin)
+
+        -- dont defer for treesitter as it will show slow highlighting
+        -- This deferring only happens only when we do "nvim filename"
+        if plugin ~= "nvim-treesitter" then
+          vim.defer_fn(function()
+            require("packer").loader(plugin)
+            if plugin == "nvim-lspconfig" then
+              vim.cmd "silent! do FileType"
+            end
+          end, 0)
+        else
+          require("packer").loader(plugin)
+        end
+      end
+    end,
+  })
+end
+
 return M