feat: add Google login flow and inbox creation (#9580)

This PR adds the following changes

1. Refactor `microsoft/callbacks_controller` to move common logic to
`oauth_callback_controller`, most of the logic is re-used for Google
2. Add UI components, `googleClient` and I18n entries for Google login
3. Add Google callback and inbox creation
4. Add a `joinUrl` utility along with specs (need to move it to utils)
5. Add `GoogleConcern`, `Google::AuthorizationsController` and
`Google::CallbacksController`

> Note: The UI is hidden for now, so we can merge this without any
hiccups, to enable it just revert the commit `05c18de`

### Preview


https://github.com/chatwoot/chatwoot/assets/18097732/1606d150-4561-49dc-838d-e0b00fe49ce3

### Linear Tickers

[CW-3370](https://linear.app/chatwoot/issue/CW-3370)
[CW-3371](https://linear.app/chatwoot/issue/CW-3371)

---------

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

app/controllers/concerns/google_concern.rb

@@ -0,0 +1,20 @@
+module GoogleConcern
+  extend ActiveSupport::Concern
+
+  def google_client
+    app_id = GlobalConfigService.load('GOOGLE_OAUTH_CLIENT_ID', nil)
+    app_secret = GlobalConfigService.load('GOOGLE_OAUTH_CLIENT_SECRET', nil)
+
+    ::OAuth2::Client.new(app_id, app_secret, {
+                           site: 'https://oauth2.googleapis.com',
+                           authorize_url: 'https://accounts.google.com/o/oauth2/auth',
+                           token_url: 'https://accounts.google.com/o/oauth2/token'
+                         })
+  end
+
+  private
+
+  def base_url
+    ENV.fetch('FRONTEND_URL', 'http://localhost:3000')
+  end
+end

app/controllers/concerns/microsoft_concern.rb

@@ -15,10 +15,6 @@ module MicrosoftConcern
 
   private
 
-  def parsed_body
-    @parsed_body ||= Rack::Utils.parse_nested_query(@response.raw_response.body)
-  end
-
   def base_url
     ENV.fetch('FRONTEND_URL', 'http://localhost:3000')
   end