feat: Google OAuth for login & signup (#6346)

This PR adds Google OAuth for all existing users, allowing users to log in or sign up via their Google account.

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Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Fayaz Ahmed <15716057+fayazara@users.noreply.github.com>
Co-authored-by: Sojan <sojan@pepalo.com>

config/routes.rb

@@ -1,11 +1,11 @@
 Rails.application.routes.draw do
   # AUTH STARTS
-  match 'auth/:provider/callback', to: 'home#callback', via: [:get, :post]
   mount_devise_token_auth_for 'User', at: 'auth', controllers: {
     confirmations: 'devise_overrides/confirmations',
     passwords: 'devise_overrides/passwords',
     sessions: 'devise_overrides/sessions',
-    token_validations: 'devise_overrides/token_validations'
+    token_validations: 'devise_overrides/token_validations',
+    omniauth_callbacks: 'devise_overrides/omniauth_callbacks'
   }, via: [:get, :post]
 
   ## renders the frontend paths only if its not an api only server