Chore: Scope URLs with account_id (#601)

* Chore: Enable Users to create multiple accounts

Addresses: #402
- migrations to split roles and other attributes from users table
- make changes in code to accommodate this change

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/views/api/v1/accounts/inboxes/index.json.jbuilder

@@ -0,0 +1,13 @@
+json.payload do
+  json.array! @inboxes do |inbox|
+    json.id inbox.id
+    json.channel_id inbox.channel_id
+    json.name inbox.name
+    json.channel_type inbox.channel_type
+    json.avatar_url inbox.channel.try(:avatar_url)
+    json.page_id inbox.channel.try(:page_id)
+    json.widget_color inbox.channel.try(:widget_color)
+    json.website_token inbox.channel.try(:website_token)
+    json.enable_auto_assignment inbox.enable_auto_assignment
+  end
+end