[#156]Rewrite the UPS shipping module based on the new api

-- Complete the admin panel for UPS shipping module
[#157]Support the length classes

-- Enable the length service as the default service in the 
store front
[#157]Support the length classes

-- Add the getKey function to get the length key
[#156]Rewrite the UPS shipping module based on the new api

-- Complete the store front for UPS shipping module