feat(apps): Shopify Integration (#11101)

This PR adds native integration with Shopify. No more dashboard apps.
The support agents can view the orders, their status and the link to the
order page on the conversation sidebar.

This PR does the following: 
- Create an integration with Shopify (a new app is added in the
integrations tab)
- Option to configure it in SuperAdmin
- OAuth endpoint and the callbacks.
- Frontend component to render the orders. (We might need to cache it in
the future)
---------

Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/composables/useUISettings.js

@@ -8,6 +8,7 @@ export const DEFAULT_CONVERSATION_SIDEBAR_ITEMS_ORDER = Object.freeze([
   { name: 'contact_attributes' },
   { name: 'previous_conversation' },
   { name: 'conversation_participants' },
+  { name: 'shopify_orders' },
 ]);
 
 export const DEFAULT_CONTACT_SIDEBAR_ITEMS_ORDER = Object.freeze([