Chore: Enable Users to create multiple accounts (#440)

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

Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/views/devise/token.json.jbuilder

@@ -7,10 +7,10 @@ json.payload do
     json.name @resource.name
     json.nickname @resource.nickname
     json.email @resource.email
-    json.account_id @resource.account_id
+    json.account_id @resource.account.id
     json.pubsub_token @resource.pubsub_token
-    json.role @resource.role
-    json.inviter_id @resource.inviter_id
+    json.role @resource.account_user.role
+    json.inviter_id @resource.account_user.inviter_id
     json.confirmed @resource.confirmed?
     json.avatar_url @resource.avatar_url
   end