chore: Add Contact Note APIs (#3266)

app/views/api/v1/models/_note.json.jbuilder

@@ -0,0 +1,9 @@
+json.id resource.id
+json.content resource.content
+json.account_id json.account_id
+json.contact_id json.contact_id
+json.user do
+  json.partial! 'api/v1/models/agent.json.jbuilder', resource: resource.user
+end
+json.created_at resource.created_at
+json.updated_at resource.updated_at