feat: Ability to access user tokens via Platform API (#11537)

- Add Platform API for generating user tokens 
- Add the swagger documentation.

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

config/routes.rb

@@ -396,6 +396,7 @@ Rails.application.routes.draw do
         resources :users, only: [:create, :show, :update, :destroy] do
           member do
             get :login
+            post :token
           end
         end
         resources :agent_bots, only: [:index, :create, :show, :update, :destroy] do