feat: print total time taken to load all plugins

lua/packer/compile.lua

@@ -85,12 +85,20 @@ local function save_profiles(threshold)
   end
   table.sort(sorted_times, function(a, b) return a[2] > b[2] end)
   local results = {}
+  local total_time = 0
   for i, elem in ipairs(sorted_times) do
     if not threshold or threshold and elem[2] > threshold then
       results[i] = elem[1] .. ' took ' .. elem[2] .. 'ms'
     end
+    total_time = total_time + elem[2]
   end
 
+  if threshold then
+    table.insert(results, '(Only showing plugins that took longer than ' .. threshold .. ' ms ' .. 'to load)')
+  end
+  table.insert(results, '')
+  table.insert(results, 'Total time: ' .. total_time .. 'ms')
+
   _G._packer = _G._packer or {}
   _G._packer.profile_output = results
 end