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/contacts/index.json.jbuilder

@@ -0,0 +1,10 @@
+json.payload do
+  json.array! @contacts do |contact|
+    json.id contact.id
+    json.name contact.name
+    json.email contact.email
+    json.phone_number contact.phone_number
+    json.thumbnail contact.avatar_url
+    json.additional_attributes contact.additional_attributes
+  end
+end